Papers

An Atomically Tailored Chiral Magnet with Small Skyrmions at Room Temperature

Tao Liu, Camelia M. Selcu, Binbin Wang, Núria Bagués, Po-Kuan Wu, Timothy Q. Hartnett, Shuyu Cheng, Denis Pelekhov, Roland A. Bennett, Joseph Perry Corbett, Jacob R. Repicky, Brendan McCullian, P. Chris Hammel, Jay A. Gupta, Mohit Randeria, Prasanna V. Balachandran, David W. McComb, Roland K. Kawakami, arXiv 2303.05106

Room-Temperature Magnetic Skyrmions in Pt/Co/Cu Multilayers

Shuyu Cheng, Nuria Bagues, Camelia M. Selcu, Jacob B. Freyermuth, Ziling Li, Binbin Wang, Shekhar Das, P. Chris Hammel, Mohit Randeria, David W. McComb, and Roland K. Kawakami, arXiv 2303.02117

Momentum-Resolved Exciton Coupling and Valley Polarization Dynamics in Monolayer WS₂

Alice Kunin, Sergey Chernov, Jin Bakalis, Ziling Li, Shuyu Cheng, Zachary H. Withers, Michael G. White, Gerd Schonhense, Xu Du, Roland K. Kawakami, and Thomas K. Allison, Physical Review Letters 130, 046202 (2023).

Scanning Tunneling Microscopy Study of the Antiferromagnetic Topological Insulator MnBi₂Se₄ 

Robert C. Walko, Tiancong Zhu , Alexander J. Bishop, Roland K. Kawakami, Jay A. Gupta, Physica E 143, 115391 (2022). 

Atomic Layer Epitaxy of Kagome Magnet Fe₃Sn₂ and Sn-modulated Heterostructures

Shuyu Cheng, Binbin Wang, Igor Lyalin, Núria Bagués, Alexander J. Bishop, David W. McComb, Roland K. Kawakami, APL Materials 10, 061112 (2022).

Kinetically-controlled epitaxial growth of Fe₃GeTe₂ van der Waals ferromagnetic films 

Wenyi Zhou, Alexander J. Bishop, Menglin Zhu, Igor Lyalin, Robert C. Walko, Jay A. Gupta, Jinwoo Hwang, Roland K. Kawakami, ACS Applied Electronic Materials 4, 3190-3197 (2022).

Ultrafast Optical Spin Switching in Ferrimagnetic Nickel Ferrite (NiFe₂O₄) Studied by XUV Reflection–Absorption Spectroscopy 

Stephen Londo, Somnath Biswas, Igor V. Pinchuk, Alexandra Boyadzhiev, Roland K. Kawakami, L. Robert Baker, J. Phys. Chem. C 126, 2669 (2022).

Extracting weak magnetic contrast from complex background contrast in plan-view FeGe thin films

Binbin Wang, Nuria Bagues, Tao Liu, Roland K. Kawakami, David W. McComb, Ultramicroscopy 232, 113395 (2022).

Atomic-scale visualization of topological spin textures in the chiral magnet MnGe 

Jacob Repicky, Po-Kuan Wu, Tao Liu, Joseph Corbett, Tiancong Zhu, Shuyu Cheng, Adam Ahmed, N. Takeuchi, J. Guerrero-Sanchez, Mohit Randeria, Roland Kawakami, Jay A. Gupta, Science 374, 1484–1487 (2021).

Van der Waals heterostructures for spintronics and opto-spintronics 

Juan F. Sierra, Jaroslav Fabian, Roland K. Kawakami, Stephan Roche, Sergio O. Valenzuela, Nature Nanotechnology 16, 856-868 (2021).

Spin–Orbit Torque in Bilayers of Kagome Ferromagnet Fe₃Sn₂ and Pt

Igor Lyalin, Shuyu Cheng, Roland K. Kawakami, Nano Letters 21, 6975–6982 (2021).

Epitaxial Growth and Domain Structure Imaging of Kagome Magnet Fe₃Sn₂

Shuyu Cheng, Igor Lyalin, Alexander J. Bishop, Roland K. Kawakami arXiv:2105.12203 (2021).

Synthesis, Magnetic Properties, and Electronic Structure of Magnetic Topological Insulator MnBi₂Se₄

Tiancong Zhu, Alexander J. Bishop, Tong Zhou, Menglin Zhu, Dante J. O’Hara, Alexander A. Baker, Shuyu Cheng, Robert C. Walko, Jacob J. Repicky, Tao Liu, Jay A. Gupta, Chris M. Jozwiak, Eli Rotenberg, Jinwoo Hwang, Igor Žutić, Roland K. Kawakami, Nano Letters 21, 5083–5090 (2021).

Coherent growth and characterization of van der Waals 1T-VSe₂ layers on GaAs(111)B using molecular beam epitaxy 

Tiancong Zhu, Dante J. O’Hara, Brenton A. Noesges, Menglin Zhu, Jacob J. Repicky, Mark R. Brenner, Leonard J. Brillson, Jinwoo Hwang, Jay A. Gupta, Roland K. Kawakami, Physical Review Materials 4, 084002 (2020).

The 2020 magnetism roadmap

Elena Yu Vedmedenko, Roland Kenji Kawakami, Denis D. Sheka, Pietro Gambardella, Andrei Kirilyuk, Atsufumi Hirohata, Christian Binek, Oksana Chubykalo-Fesenko, Stefano Sanvito, Brian J. Kirby, Julie Grollier, Karin Everschor-Sitte, Tobias Kampfrath, Chun Yeol You, Andreas Berger,  Journal of Physics D: Applied Physics 53, 453001 (2020).

Suppression of magnetic ordering in Fe-deficient Fe_3-xGeTe₂ from application of pressure

Dante J. O’Hara, Zachary E. Brubaker, Ryan L. Stillwell, Earl F. O’Bannon, Alexander A. Baker, Daniel Weber, Leonardus Bimo Bayu Aji, Joshua E. Goldberger, Roland K. Kawakami, Rena J. Zieve, Jason R. Jeffries, Scott K. McCall, Physical Review B 102, 054405 (2020).

Chemical migration and dipole formation at van der Waals interfaces between magnetic transition metal chalcogenides and topological insulators

Brenton A. Noesges, Tiancong Zhu, Jacob J. Repicky, Sisheng Yu, Fengyuan Yang, Jay A. Gupta, Roland K. Kawakami, Leonard J. Brillson, Physical Review Materials 4, 054001 (2020).

Spatial Frequency Selection in Lorentz 4D-Scanning Transmission Electron Microscopy Reconstruction

Binbin Wang, Nuria Bagues, Tao Liu, Jiaqiang Yan, Roland Kawakami, David McComb, Microscopy and Microanalysis 26, 1902-1905 (2020).

Imaging of Magnetic Textures in Polycrystalline FeGe Thin Films via in-situ Lorentz Transmission Electron Microscopy 

Nuria Bagues, Binbin Wang, Tao Liu, Camelia Selcu, Stephen Boona, Roland Kawakami, Mohit Randeria, and David McComb, Microscopy and Microanalysis 26, 1700-1702 (2020).

Investigation of Antiphase Domain Boundaries in Cobalt Ferrite Thin Films via High Resolution Scanning Transmission Electron Microscopy

Amanda Trout, Igor Pinchuk, Michael Newburger, Roland Kawakami, David McComb, Microscopy and Microanalysis 26, 972-974 (2020).

Ultrafast Spin Crossover in a Room-Temperature Ferrimagnet: Element-Specific Spin Dynamics in Photoexcited Cobalt Ferrite

Stephen Londo, Somnath Biswas, Jakub Husek, Igor V. Pinchuk, Michael J. Newburger, Alexandra Boyadzhiev, Amanda H. Trout, David W. McComb, Roland Kawakami, L. Robert Baker, The Journal of Physical Chemistry C 124, 11368-11375 (2020).

Determining Surface Terminations and Chirality of Noncentrosymmetric FeGe Thin Films via Scanning Tunneling Microscopy 

Joseph P. Corbett, Tiancong Zhu, Adam S. Ahmed, Steven J. Tjung, Jacob J. Repicky, Takahiro Takeuchi, Jonathan Guerrero-Sanchez, Noboru Takeuchi, Roland K. Kawakami, Jay A. Gupta, ACS Applied Materials & Interfaces 12, 9896-9901 (2020).

Spintronics in 2D Materials 

Wei Han and Roland Kawakami, in Spintronics Handbook, Second Edition: Spin Transport and Magnetism : Volume Three: Nanoscale Spintronics and Applications (Editors: E. Y. Tsymbal, I. Žutić, CRC Press, 2019).

Spectroscopic evaluation of charge-transfer doping and strain in graphene/MoS₂ heterostructures

Rahul Rao, Ahmad E. Islam, Simranjeet Singh, Rajiv Berry, Roland K. Kawakami, Benji Maruyama, and Jyoti Katoch, Physical Review B 99, 195401 (2019).

Epitaxial growth of cobalt doped TiO₂ thin films on LaAlO₃ (100) substrate by molecular beam epitaxy and their opto-magnetic based applications

Swaleha Naseem, Igor V. Pinchuk, Yunqiu Kelly Luo, Roland K. Kawakami, Shakeel Khan, Shahid Husain, Wasi Khan, Applied Surface Science 493, 691-702 (2019).

Spin Absorption by In Situ Deposited Nanoscale Magnets on Graphene Spin Valves 

Walid Amamou, Gordon Stecklein, Steven J. Koester, Paul A. Crowell, and Roland K. Kawakami, Phys. Rev. Applied 10, 044050 (2018) pdf

Tuning Spin Dynamics and Localization near the Metal-Insulator Transition in Fe/GaAs Heterostructures

Yu-Sheng Ou, N. J. Harmon, Patrick Odenthal, Roland K. Kawakami, Michael E. Flatté, Ezekiel Johnson-Halperin, Physical Review B 98, 134444 (2018). pdf

Microscopy of Hydrogen and Hydrogen-Vacancy Defect Structures on Graphene Devices

Dillon Wong, Yang Wang, Wuwei Jin, Hsin-Zon Tsai, Aaron Bostwick, Eli Rotenberg, Roland K. Kawakami, Alex Zettl, Arash A. Mostofi, Johannes Lischner and Michael F. Crommie, Physical Review B 98, 155436 (2018). pdf

Transport Spectroscopy of Sublattice-Resolved Resonant Scattering in Hydrogen-Doped Bilayer Graphene

Jyoti Katoch, Tiancong Zhu, Denis Kochan, Simranjeet Singh, Jaroslav Fabian and Roland K. Kawakami, Physical Review Letters 121, 136801 (2018). pdf

Strong and Tunable Spin Lifetime Anisotropy in Dual-Gated Bilayer Graphene

Jinsong Xu, Tiancong Zhu, Yunqiu Kelly Luo, Yuan-Ming Lu and Roland K. Kawakami, Physical Review Letters 121, 127703 (2018). Editors’ Suggestion. Highlighted in Physics

Importance of Paramagnetic Background Subtraction for Determining the Magnetic Moment in Epitaxially Grown Ultrathin van der Waals Magnets

Dante O’Hara, Tiancong Zhu and Roland K. Kawakami, IEEE Magnetics Letters 9, 1405805 (2018). pdf

Spin Inversion in Graphene Spin Valves by Gate-Tunable Magnetic Proximity Effect at One-Dimensional Contacts

Jinsong Xu, Simranjeet Singh, Jyoti Katoch, Guanzhong Wu, Tiancong Zhu, Igor Žutić and Roland K. Kawakami, Nature Communications 9, 2869 (2018). pdf

Topological Dirac Semimetal Na₃Bi Films in the Ultrathin Limit via Alternating Layer Molecular Beam Epitaxy

Igor V. Pinchuk, Thaddeus J. Asel, Andrew Franson, Tiancong Zhu, Yuan-Ming Lu, Leonard J. Brillson, Ezekiel Johnston-Halperin, Jay A. Gupta, Roland K. Kawakami, APL Materials 6, 086103 (2018) pdf

Probing Tunneling Spin Injection into Graphene via Bias Dependence

Tiancong Zhu, Simranjeet Singh, Jyoti Katoch, Hua Wen, Kirill Belashchenko, Igor Žutić, Roland K. Kawakami Physical Review B 98, 054412 (2018) pdf

Electronic Structure of Exfoliated and Epitaxial Hexagonal Boron Nitride

Roland J. Koch, Jyoti Katoch, Simon Moser, Daniel Schwarz, Roland K. Kawakami, Aaron Bostwick, Eli Rotenberg, Chris Jozwiak and Søren Ulstrup  Physical Review Materials 2, 074006 (2018) pdf

Modeling the Oblique Spin Precession in Lateral Spin Valves for Accurate Determination of Spin Lifetime Anisotropy: Effect of Finite Contact Resistance and Channel Length

Tiancong Zhu and Roland K. Kawakami, Physical Review B 97, 144413 (2018) pdf

Chiral Bobbers and Skyrmions in Epitaxial FeGe/Si(111) Films

Adam S. Ahmed, James Rowland, Bryan D. Esser, Sarah Dunsiger, David W. McComb, Mohit Randeria, and Roland K. Kawakami, Physical Review Materials (Rapid) 2, 041401(R) (2018)  pdf

Room Temperature Intrinsic Ferromagnetism in Epitaxial Manganese Selenide Films in the Monolayer Limit

Dante J. O’Hara, Tiancong Zhu, Amanda H. Trout, Adam S. Ahmed, Yunqiu (Kelly) Luo, Choong Hee Lee, Mark R. Brenner, Siddharth Rajan, Jay A. Gupta, David W. McComb, and Roland K. Kawakami Nano Letters 18, 3125 (2018) pdf

Magnetic Proximity Effect in Pt/CoFe₂O₄ Bilayers

Walid Amamou, Igor V. Pinchuk, Amanda Hanks, Robert Williams, Nikolas Antolin, Adam Goad, Dante J. O’Hara, Adam S. Ahmed, Wolfgang Windl, David W. McComb, and Roland K. Kawakami, Physics Review Materials 2, 011401 (R) (2018). pdf  Editors’ Suggestion

Giant Spin-Splitting and Gap Renormalization Driven by Trions in Single-Layer WS₂/h-BN Heterostructures

Jyoti Katoch, Søren Ulstrup, Roland J. Koch, Simon Moser, Kathleen M. McCreary, Simranjeet Singh, Jinsong Xu, Berend T. Jonker, Roland K. Kawakami, Aaron Bostwick, Eli Rotenberg, and Chris Jozwiak,  Nature Physics 14, 355-359 (2018).pdf

Imaging Spin Dynamics in Monolayer WS₂ by Time-Resolved Kerr Rotation Microscopy

Elizabeth J. McCormick, Michael J. Newburger, Yunqiu (Kelly) Luo, Kathleen M. McCreary, Simranjeet Singh, Iwan B Martin, Edward J Cichewicz Jr, Berend T. Jonker, Roland K. Kawakami, 2D Materials 5, 011010 (2018). pdf

J.-P. Wang, S. S. Sapatnekar, C. H. Kim, P. Crowell, S. Koester, S. Datta, K. Roy, A. Raghunathan, X. S. Hu, M. Niemier, A. Naeemi, C.-L. Chien, C. Ross, and R. Kawakami, in Proceedings of the 54th Annual Design Automation Conference 2017 (ACM, Austin, TX, USA, 2017), pp. 1.  pdf

Strontium Oxide Tunnel Barriers for High Quality Spin Transport and Large Spin Accumulation in Graphene

Simranjeet Singh, Jyoti Katoch, Tiancong Zhu, Ryan J. Wu, Adam S. Ahmed, Walid Amamou, Dongying Wang, K Andre Mkhoyan and Roland K. Kawakami, Nano Letters 17, 7578–7585 (2017). pdf

Spatially Resolving Density-Dependent Screening Around a Single Charged Atom in Graphene

Dillon Wong, Fabiano Corsetti, Yang Wang, Victor W. Brar, Hsin-Zon Tsai, Qiong Wu, Roland K. Kawakami, Alex Zettl, Arash A. Mostofi, Johannes Lischner, and Michael F. Crommie, Physical Review B 95, 205419 (2017).

Uniform Large-Area Growth of Nanotemplated High-Quality Monolayer MoS₂

Justin R. Young, Michael Chilcote, Matthew Barone, Jinsong Xu, Jyoti Katoch, Yunqiu Kelly Luo, Sara Mueller,  Thaddeus J. Asel,  Susan K. Fullerton-Shirey, Roland Kawakami, Jay A. Gupta, Leonard J. Brillson, and Ezekiel Johnston-Halperin, Applied Physics Letters 110, 263103 (2017).

Opto-Valleytronic Spin Injection in Monolayer MoS₂/Few-Layer Graphene Hybrid Spin Valves

Yunqiu (Kelly) Luo, Jinsong Xu, Tiancong Zhu, Guanzhong Wu, Elizabeth Joan McCormick, Mahesh R. Neupane, Wenbo Zhan, and Roland K. Kawakami, Nano Letters 17, 3877–3883 (2017). pdf

Molecular Beam Epitaxy Growth of [CrGe/MnGe/FeGe] Superlattices: Toward Artificial B20 Skyrmion Materials with Tunable Interactions

Adam S. Ahmed, Bryan D. Esser, James Rowland, David W. McComb, and Roland K. Kawakami, Journal of Crystal Growth 467, 38-46 (2017). pdf

Growth of Uniform CaGe₂ Films by Alternating Layer Molecular Beam Epitaxy

Jinsong Xu, Jyoti Katoch, Adam S. Ahmed, Igor V. Pinchuk, Justin R. Young, Ezekiel Johnston-Halperin, Jonathan Pelz, Roland. K. Kawakami, Journal of Crystal Growth 460, 134-138 (2017). pdf

Molecular Beam Epitaxy of 2D-Layered Gallium Selenide on GaN Substrates

Choong Hee Lee, Sriram Krishnamoorthy, Dante J. O’Hara, Jared M. Johnson, John Jamison, Roberto C. Myers, Roland K. Kawakami, Jinwoo Hwang, Siddharth Rajan, Journal of Applied Physics 121, 094302 (2017). pdf

Strong Modulation of Spin Currents in Bilayer Graphene by Static and Fluctuating Proximity Exchange Fields

Simranjeet Singh, Jyoti Katoch, Tiancong Zhu, Keng-Yuan Meng, Tianyu Liu, Jack T. Brangham, Fengyuan Yang, Michael Flatté and Roland K. Kawakami, Physical Review Letters 118, 187201 (2017).  pdf  Editors’ Suggestion

The Effect of Preparation Conditions on Raman and Photoluminescence of Monolayer WS₂

Kathleen M. McCreary, Aubrey T. Hanbicki, Simranjeet Singh, Roland K. Kawakami, Glenn G. Jernigan, Masa Ishigami, Amy Ng, Todd H. Brintlinger, Rhonda M. Stroud, and Berend T. Jonker, Scientific Reports 6, 35154 (2016).  pdf

Spatially Resolved Electronic Properties of Single-Layer WS₂ on Transition Metal Oxides

Søren Ulstrup*, Jyoti Katoch*, Roland J. Koch, Daniel Schwarz, Simranjeet Singh, Kathleen M. McCreary, Hyang Keun Yoo, Jinsong Xu, Berend T. Jonker, Roland K. Kawakami, Aaron Bostwick, Eli Rotenberg, and Chris Jozwiak, ACS Nano 10, 10058-10067 (2016). pdf

NaSn₂As₂: An Exfoliatable Layered van der Waals Zintl Phase

Maxx Q. Arguilla*, Jyoti Katoch*, Kevin Krymowski, Nicholas D. Cultrara, Jinsong Xu, Xiaoxiang Xi, Amanda Hanks, Shishi Jiang, Richard D. Ross, Roland J. Koch, Søren Ulstrup, Aaron Bostwick, Chris Jozwiak, David W. McComb, Eli Rotenberg, Jie Shan, Wolfgang Windl, Roland Kawakami, and Joshua E. Goldberger, ACS Nano 10, 9500-9508 (2016). pdf

Nanosecond spin relaxation times in single layer graphene spin valves with hexagonal boron nitride tunnel barriers

Simranjeet Singh, Jyoti Katoch, Jinsong Xu, Cheng Tan, Tiancong Zhu, Walid Amamou, James Hone, and Roland Kawakami, Applied Physics Letters 109, 122411 (2016). pdf

Molecular beam epitaxy growth of SrO buffer layers on graphite and graphene for the integration of complex oxides

Adam Ahmed, Hua Wen, Taisuke Ohta, Igor Pinchuk, Tiancong Zhu, Thomas Beechem, Roland Kawakami, Journal of Crystal Growth 447, 5 (2016). pdf

Contact induced spin relaxation in graphene spin valves with Al₂O₃ and MgO tunnel barriers

Walid Amamou, Zhisheng Lin, Jeremiah van Baren, Serol Turkyilmaz, Jing Shi, and Roland K. Kawakami, APL Materials 4, 032503 (2016). pdf

Experimental Demonstration of XOR Operation in Graphene Magnetologic Gates at Room Temperature

Hua Wen, Hanan Dery, Walid Amamou, Tiancong Zhu, Zhisheng Lin, Jing Shi, Igor Žutić, Ilya Krivorotov, Lu J. Sham, Roland K. Kawakami, Phys. Rev. Applied 5, 044003 (2016). pdf

Exchange-Driven Spin Relaxation in Ferromagnet-Oxide-Semiconductor Heterostructures

Yu-Sheng Ou, Yi-Hsin Chiu, N. J. Harmon, Patrick Odenthal, Matthew Sheffield, Michael Chilcote, R. K. Kawakami, M. E. Flatté, and E. Johnston-Halperin Phys. Rev. Lett. 116, 107201 (2016). pdf

Ferromagnetic resonance spin pumping and electrical spin injection in silicon-based metal-oxide-semiconductor heterostructures

Yong Pu, Patrick M. Odenthal, Rohan Adur, Jonas Beardsley, Adrian G. Swartz, Denis V. Pelekhov, Michael E. Flatté, Roland K. Kawakami, Jon Pelz, P. Chris Hammel, Ezekiel Johnston-Halperin, Phys. Rev. Lett. 115, 246602 (2015). pdf

Large area epitaxial germanane for electronic devices

Walid Amamou, Patrick M. Odenthal, Elizabeth J. Bushong, Dante J. O’Hara, Yunqiu Kelly Luo, Jeremiah van Baren, Igor Pinchuk, Yi Wu, Adam S. Ahmed, Jyoti Katoch, Marc W. Bockrath, Harry W. K. Tom, Joshua E. Goldberger and Roland K. Kawakami, 2D Materials 2, 035012 (2015)  pdf

Correlating spin transport and electrode magnetization in a graphene spin valve: Simultaneous magnetic microscopy and non-local measurements

Andrew J. Berger, Michael R. Page, Hua Wen, Kathleen M. McCreary, Vidya P. Bhallamudi, Roland K. Kawakami, and P. Chris Hammel, Applied Physics Letters 107, 142406 (2015). pdf

Tuning the dynamic exchange interaction in ferromagnet/semiconductor heterostructures

Yu-Sheng Ou, Yi-Hsin Chiu, N. J. Harmon, Patrick Odenthal, Matthew Sheffield, Michael Chilcote, R. K. Kawakami, M. E. Flatté, E. Johnston-Halperin, SPIE 9551, 95510E (2015).

Spin Amplification by Controlled Symmetry Breaking for Spin-Based Logic

Roland K. Kawakami, 2D Materials 2, 034001 (2015).

Graphene Spintronics

Wei Han, Roland K. Kawakami, Martin Gmitra, and Jaroslav Fabian, Nature Nanotechnology 9, 794–807 (2014).

Current-Based Detection of Nonlocal Spin Transport in Graphene for Spin-Based Logic Applications

Hua Wen, Tiancong Zhu, Yunqiu Kelly Luo, Walid Amamou, Roland K Kawakami, Journal of Applied Physics 115, 17B741 (2014)

Magnetization dynamics of cobalt grown on graphene

Andrew J. Berger, Walid Amamou, Shane P. White, Rohan Adur, Yong Pu, Roland K. Kawakami, P. Chris Hammel, Journal of Applied Physics 115, 17C510 (2014)

Spin Polarization of Co(0001)/graphene junctions from first principles

Gilherme Sipahi, Igor Zutic, N.Atodiresei, Roland Kawakami, Predrag Lazic, Journal of Physics: Condensed Matter 26, 104204 (2014)

Direct Comparison of Graphene Devices Before and After Transfer to Different Substrates

Raymond Sachs, Zhisheng Lin, Patrick Odenthal, Roland Kawakami, Jing Shi, Applied Physics Letters 104, 033103 (2014)

Epitaxial Co-Deposition Growth of CaGe₂ Films by Molecular Beam Epitaxy for Large Area Germanane

Igor V Pinchuk, Patrick M Odenthal, Adam S Ahmed, Walid Amamou, Joshua E Goldberger, Roland K Kawakami, Journal of Materials Research 29, 410-416 (2014)  pdf

2-Dimensional Transition Metal Dichalcogenides with Tunable Direct Band Gaps: MoS_2(1-x)Se_2x Monolayers

John Mann, Quan Ma, Patrick M Odenthal, Miguel Isarraraz, Duy Le, Edwin Preciado, David Barroso, Koichi Yamaguchi, Gretel von Son Palacio, Andrew Nguyen, Tai Tran, Michelle Wurch, Ariana Nguyen, Velveth Klee, Sarah Bobek, Dezheng Sun, Tony Heinz, Talat S. Rahman, Roland Kawakami, Ludwig Bartels, Advanced Materials 26, 1399-1404 (2014)

A systematic approach to interpreting Hanle spin precession data in non-local spin valves

Adrian G. Swartz, Kathleen M. McCreary, Wei Han, Hua Wen, Roland K. Kawakami, SPIE NanoScience+ Engineering 8813, 881328 (2013)

Correlation of electrical spin injection and non-linear charge-transport in Fe/MgO/Si

Yong Pu, Jonas Beardsley, Patrick M. Odenthal, Adrian G. Swartz, Roland K. Kawakami, P. Chris Hammel, Ezekiel Johnston-Halperin, Jairo Sinova, Jon P. Pelz, Applied Physics Letters 103, 012402 (2013)

Integrating MBE materials with graphene to induce novel spin-based phenomena

Adrian G Swartz, Kathleen M McCreary, Wei Han, Jared JI Wong, Patrick M Odenthal, Hua Wen, Jen-Ru Chen, Roland K Kawakami, Yufeng Hao, Rodney S Ruoff, Jaroslav Fabian, Journal of Vacuum Science and Technology B 31, 04D105 (2013)

Controlled argon beam-induced desulfurization of monolayer molybdenum disulfide

Q. Ma, P. M. Odenthal, J. Mann, D. Le, C. S. Wang, Y. Zhu, T. Chen, D. Sun, K. Yamaguchi, T. Tran, M. Wurch, J. L McKinley, J. Wyrick, K. M. Magnone, T. F. Heinz, T. S. Rahman, R. Kawakami, L. Bartels, Journal of Physics: Condensed Matter 25, 252201 (2013)

Facile Growth of Monolayer MoS₂ Film Areas on SiO₂

John Mann, Dezheng Sun, Quan Ma, Jen-Ru Chen, Edwin Preciado, Taisuke Ohta, Bogdan Diaconescu, Koichi Yamaguchi, Tai Tran, Michelle Wurch, KatieMarie Magnone, Tony F Heinz, Gary L Kellogg, Roland Kawakami, Ludwig Bartels, The European Physical Journal B 86, 1-4 (2013)

Control of Schottky Barriers in Single Layer MoS₂ Transistors with Ferromagnetic Contacts

Jen-Ru Chen, Patrick M. Odenthal, Adrian G. Swartz, George Floyd Christensen, Hua Wen, Kelly Yunqiu Luo, Roland K Kawakami, Nano Letters 13, 3106-3110 (2013)

Observing Atomic Collapse Resonances in Artificial Nuclei on Graphene

Yang Wang, Dillon Wong, Andrey V Shytov, Victor W Brar, Sangkook Choi, Qiong Wu, Hsin-Zon Tsai, William Regan, Alex Zettl, Roland K Kawakami, Steven G Louie, Leonid S Levitov, Michael F Crommie, Science 340, 734-737 (2013)

Effect of in situ deposition of Mg adatoms on spin relaxation in graphene

Adrian G Swartz, Jen-Ru Chen, Kathleen M McCreary, Patrick M Odenthal, Wei Han, and Roland K Kawakami, Phys. Rev. B 87, 075455 (2013)

Measuring the Casimir force gradient from graphene on a SiO₂ substrate

A. A. Banishev, H. Wen, J. Xu, R. K. Kawakami, G. L. Klimchitskaya, V. M. Mostepanenko, and U. Mohideen, Physical Review B 87, 205433 (2013)

Comparison of spin lifetimes in n-Ge characterized between three-terminal and four-terminal nonlocal Hanle measurements

L.T. Chang, W. Han, Y. Zhou, J. Tang, I. A. Fischer, M. Oehme, J. Schulze, R. K. Kawakami, and K. L. Wang, Semiconductor Science and Technology 28, 015018 (2013)

Integration of the ferromagnetic insulator EuO onto graphene

Adrian G. Swartz, Patrick M. Odenthal, Yufeng Hao, Rodney S. Ruoff, and Roland K. Kawakami, ACS Nano 6, 10063-10069 (2012)

Magnetic moment formation in graphene detected by scattering of pure spin currents

Kathleen M. McCreary, Adrian G. Swartz, Wei Han, Jaroslav Fabian, and Roland K. Kawakami, Phys. Rev. Lett. 109, 186604 (2012)

Electric field control of the Verwey transition and induced magnetoelectric effect in magnetite

Jared J. I. Wong, Adrian G. Swartz, Renjing Zheng, Wei Han, and Roland K. Kawakami, Phys. Rev. B (Rapid Comm.) 86, 060409 (2012)

Spin relaxation in single-layer graphene with tunable mobility

Wei Han, Jen-Ru Chen, Deqi Wang, Kathleen M. McCreary, Hua Wen, Adrian G. Swartz, Jing Shi, and Roland K. Kawakami, Nano Lett. 12, 3443-3447 (2012)

TiO₂ as an electrostatic template for epitaxial growth of EuO on MgO(001) by reactive molecular beam epitaxy

Adrian G. Swartz, Jared J. I. Wong, Igor V. Pinchuk, and Roland K. Kawakami, J. Appl. Phys. 111, 083912 (2012)

Electrical spin injection and transport in germanium

Yi Zhou, Wei Han, Li-Te Chang, Faxian Xiu, Minsheng Wang, Michael Oehme, Inga A. Fischer, Joerg Schulze, Roland K. Kawakami, and Kang L. Wang, Phys. Rev. B 84, 125323 (2011)  Dataset

REVIEW: Spin transport and relaxation in graphene

Wei Han, Kathleen M. McCreary, Kyle Pi, Wei-Hua Wang, Yan Li, Hua Wen, Jen-Ru Chen, and Roland K. Kawakami, J. Magn. Magn. Mater. 324, 369 (2012). Dataset

Thermal annealing effect on spin coherence in ZnO single crystals

Z. Yang, Y. Li, D. C. Look, H. M. Zhou, W. V. Chen, R. K. Kawakami, P. K. L. Yu, and J. L. Liu, J. Appl. Phys. 110, 016101 (2011)

Enhanced spin injection efficiency and extended spin lifetimes in graphene spin valves

Wei Han, Jen-Ru Chen, Kathleen M. McCreary, Hua Wen, and Roland K. Kawakami, Proc. SPIE, Vol. 8100, 81000Q (2011) Dataset

Spin relaxation in single-layer and bilayer graphene

Wei Han, Roland K. Kawakami, Phys. Rev. Lett. 107, 047207 (2011) Dataset

Metallic and insulating adsorbates on graphene

Kathleen M. McCreary, Kyle Pi, and Roland K. Kawakami, Appl. Phys. Lett. 98, 192101 (2011)  Dataset

Epitaxial EuO thin films on GaAs

Adrian G. Swartz, John Ciraldo, Jared J. I. Wong, Yan Li, Wei Han, Tao Lin, Shawn Mack, Jing Shi, David D. Awschalom, and Roland K. Kawakami, Appl. Phys. Lett. 97, 112509 (2010)

Tunneling Spin Injection into Single Layer Graphene 

Wei Han, Kyle Pi, , Kathleen M. McCreary, Yan Li, Jared J. I. Wong, Adrian G. Swartz and Roland K. Kawakami, Phys. Rev. Lett. 105, 167202 (2010)

Oscillatory Spin Polarization and Magneto-Optical Kerr Effect in Fe3O4 Thin Films on GaAs(001)

Yan Li, Wei Han, Adrian G. Swartz, Kyle Pi, Jared J. I. Wong, Shawn Mack and David D. Awschalom and Roland K. Kawakami, Phys. Rev. Lett. 105, 167203 (2010)

Room-Temperature Electric-Field Controlled Ferromagnetism in Mn_0.05Ge_0.95 Quantum Dots

Faxian Xiu, Yong Wang, Jiyoung Kim, Pramey Upadhyaya, Yi Zhou, Xufeng Kou, Wei Han, Roland K. Kawakami, Jin Zou and Kang L. Wang, ACS Nano 4, 4948-4954 (2010)

Manipulation of Spin Transport in Graphene by Surface Chemical Doping

Kyle Pi, Wei Han, Kathleen M. McCreary, Adrian G. Swartz, Yan Li, and Roland K. Kawakami, Phys. Rev. Lett. 104, 187201 (2010)

Effect of cluster formation on graphene mobility

Kathleen M. McCreary, Kyle Pi, Adrian G. Swartz, Wei Han, Wenzhong Bao, Chun Ning Lau, Francisco Guinea, Mikhail I. Katsnelson, and Roland K. Kawakami, Phys. Rev. B 81, 115453 (2010)

Tailoring interlayer exchange coupling of ferromagnetic films across MgO with Fe nanoclusters

Jared J. I. Wong, Luciana Ramirez, Adrian G. Swartz, Andrew Hoff, Wei Han, Yan Li, and Roland K. Kawakami, Phys. Rev. B 81, 094406 (2010)

Investigating the origin of Fermi level pinning in Ge Schottky junctions using epitaxially grown ultrathin MgO films

Yi Zhou, Wei Han, Yong Wang, Faxian Xiu, Jin Zou, Roland K. Kawakami, and Kang. L. Wang, Appl. Phys. Lett. 96, 102103 (2010)

Growth of single-crystalline, atomically smooth MgO films on Ge(0 0 1) by molecular beam epitaxy

Wei Han, Yi Zhou, Yong Wang, Yan Li, Jared. J. I. Wong, Kyle Pi, Adrian G. Swartz, Kathleen M. McCreary, Faxian Xiu, Kang L. Wang, Jin Zou, and Roland K. Kawakami, J. Crystal Growth 312, 44 (2010)

Spin transport in graphite and graphene spin valves

Wei Han, Kyle Pi, Wei-Hua Wang, Kathleen M. McCreary, Yan Li, Wenzhong Bao, Peng Wei, Jing Shi, Chun Ning Lau, and Roland K. Kawakami, Proc. SPIE, Vol. 7398, 739819 (2009).Dataset

Electronic doping and scattering by transition metals on graphene

K. Pi, K. M. McCreary, W. Bao, Wei Han, Y. F. Chiang, Yan Li, S.-W. Tsai, C. N. Lau, and R. K. Kawakami, Phys. Rev. B 80, 075406 (2009).Dataset

Engineering of tunnel junctions for prospective spin injection in germanium

Yi Zhou, Masaaki Ogawa, Mingqiang Bao, Wei Han, Roland K. Kawakami, and Kang L. Wang, Appl. Phys. Lett. 94, 242104 (2009)

Electrical detection of spin precession in single layer graphene spin valves with transparent contacts

Wei Han, K. Pi, W. Bao, K. M. McCreary, Yan Li, W. H. Wang, C. N. Lau, and R. K. Kawakami, Appl. Phys. Lett. 94, 222109 (2009)Dataset

Oxidation-induced biquadratic coupling in Co/Fe/MgO/Fe(001)

Y. F. Chiang, Jared J. I. Wong, X. Tan, Yan Li, K. Pi, W. H. Wang, H. W. K. Tom, and R. K. Kawakami, Phys. Rev. B 79, 184410 (2009)

Electron-Hole Asymmetry of Spin Injection and Transport in Single-Layer Graphene

Wei Han, W. H. Wang, K. Pi, K. M. McCreary, W. Bao, Yan Li, F. Miao, C. N. Lau, and R. K. Kawakami, Phys. Rev. Lett. 102, 137205 (2009).Dataset

Fundamentals of spintronics in metal and semiconductor systems 

R. K. Kawakami, K. M. McCreary, Y. Li, “Chapter 5, Fundamentals of Spintronics in Metal and Semiconductor Systems,” in Nanoelectronics and Photonics: From Atoms to Materials, Devices, and Architectures, A. Korkin and F. Rosei, editors, Springer (2008).

Growth of atomically smooth MgO films on graphene by molecular beam epitaxy

W. H. Wang, W. Han, K. Pi, K. M. McCreary, F. Miao, W. Bao, C. N. Lau, and R. K. Kawakami, Appl. Phys. Lett. 93, 183107 (2008)Dataset

Inversion of Ferromagnetic Proximity Polarization by MgO Interlayers

Yan Li, Y. Chye, Y. F. Chiang, K. Pi, W. H. Wang, J. M. Stephens, S. Mack, D. D. Awschalom, and R. K. Kawakami, Phys. Rev. Lett. 100, 237205 (2008)

Magnetotransport properties of mesoscopic graphite spin valves

W. H. Wang, K. Pi, Y. Li, Y. F. Chiang, P. Wei, J. Shi, and R. K. Kawakami, Phys. Rev. B (Rapid Comm.) 77, 020402 (2008)

Spin-polarized transport in magnetically assembled carbon nanotube spin valves

R. Thamankar, S. Niyogi, B. Y. Yoo, Y. W. Rheem, N. V. Myung, R. C. Haddon, and R. K. Kawakami, Appl. Phys. Lett. 89, 033119 (2006).

Magnetically Assembled Multiwalled Carbon Nanotubes on Ferromagnetic Contacts

S. Niyogi, C. Hangarter, R. M. Thamankar, Y. F. Chiang, R. K. Kawakami, N. V. Myung, and R. C. Haddon, Journal of Physical Chemistry B 108, 19818 (2004)