University of Minnesota
School of Physics & Astronomy
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Ke Wang

kewang @ umn.edu

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Summary of Interests
Novel quantum physics in gate-defined nanostructures on 2D Van der Waals materials

About My Work

I am joining the School of Physics and Astronomy, University of Minnesota, Twin Cities as an assistant professor on Jan 11th, 2018. My field of study is experimental condensed matter physics, and my new laboratory will be focusing on studying novel quantum physics in gate-defined nanostructures on 2D Van der Waals materials.

Electronic properties of solids can undergo dramatic change when the material thickness is reduced to the atomic limit. Notably, even the band structures of mono-layers and bi-layers can be distinctively different in both graphene and transition metal dichalcogenide. The exotic bandstructures of 2D materials are uniquely different from those in conventional 2DEGs, including relativistic dispersion relationship, displacement-field tunable bandgap, spin-valley locking near band edges, and anisotropic effective mass.

We further tailor these interesting bandstructures to new platforms of studying novel quantum physics. We prepare ultra high quality atomically-thin electronic systems by assembling Van der Waals heterostructures encapsulated in hexagonal boron nitrides, and fabricate gate-defined nanostructures using state-of-the-art lithography techniques. With experimental control over local Hamiltonians, we manipulate spin, layer, valley and sublattice quantum numbers towards realizing novel functional quantum devices in optoelectronics, spintronics, valleytronics and quantum computing, and study new phases of matter such as Dirac fluid, Luttinger liquid, Bell states and non-Abelian fractional quantum Hall excitations.

Selected Publications

K. Wang, A. Harzheim, T. Taniguchi, K. Watanabe, P. Kim, Tunneling Spectroscopy of Quantum Hall Edge States in Gate-defined Bilayer Graphene PN Networks, manuscript in preparation (2017)

K. Wang*, G-H. Lee*, T. Taniguchi, K. Watanabe, P. Kim, A Quantum Transistor Based on Dirac-fermion-optics, Manuscript in preparation

X. Mi, T. M. Hazard, X. Mi, K. Wang, J. R. Petta, Magnetotransport Studies of Mobility Limiting Mechanisms in Undoped Si/SiGe Heterostructures, Phys. Rev. B 92 (3), 035304 (2015). [abstract]

K. Wang, C. Payette, Y. Dovzhenko, P. W. Deelman J. R. Petta, Charge Relaxation in a Single-electron Si/SiGe Double Quantum Dot, Phys. Rev. Lett. 111, 046801 (2013) [abstract]

Y. Dovzhenko, K. Wang, M. D. Schroer, J. R. Petta, Electrically controlling single spin coherence in semiconductor nanostructures, Book chapter in "Quantum Dots: optics, electron transport and future applications", edited by A. Tartakovskii, Cambridge University Press (2012).

C. Payette, K. Wang, P. J. Koppinen, Y. Dovzhenko, J. C. Sturm, J. R. Petta, Single Charge Sensing and Transport in Double quantum dots fabricated from commercially grown Si/SiGe heterostructures, Appl. Phys. Lett. 100, 043508 (2012) [abstract]

2. D. Wintz*, K. Chaudhary*, K. Wang, L. Jauregui, A. Ambrosio, A. Y. Zhu, R. C. Devlin, M. Tamagnone, J. D. Crossno, K. Watanabe, T. Taniguchi, P. Kim, F. Capasso, Guided Modes of Anisotropic van der Waals Materials Investigated by Near-Field Scanning Optical Microscopy, arXiv:1706.00708 [physics.optics] [abstract]

S. Bhandari, K. Wang, K. Watanabe, T. Taniguchi, P. Kim, R. M. Westervelt, Imaging electron flow and quantum dot formation in MoS2 nanostructures, arXiv:1701.07532 [cond-mat.mes-hall] [abstract]

Y. Shimazaki, T. Yoshizawa, I. V. Borzenets, K. Wang, X. Liu, K. Watanabe, T. Taniguchi, P. Kim, M. Yamamoto, and S. Tarucha, Landau level evolution driven by band hybridization in mirror symmetry broken ABA-stacked trilayer graphene, Mesoscale and Nanoscale Physics (cond-mat.mes-hall) [abstract]

K. Wang, T. Taniguchi, K. Watanabe, P. Kim, Engineering Quantum Confinement in Semiconducting van der Waals Heterostructure, arXiv:1610.02929 [cond-mat.mes-hall] [abstract]

J. Crossno, J. Shi, K. Wang, X. Liu, A. Harzheim, A. Lucas, S. Sachdev, P. Kim, T. Taniguchi, K. Watanabe, T. Ohki, K. Fong, Observation of the Dirac fluid and the Breakdown of the Wiedemann-Franz law in Graphene, Science 351, 1058 (2016) [abstract]

D. M. Zajac, T. M. Hazard, X. Mi, K. Wang, J. R. Petta, A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots, Appl. Phys. Lett. 106, 223507 (2015) [abstract]

Education

Postdoctoral Fellow, Harvard University, 2014-2017
Ph. D., Princeton University, 2014
B. S., University of Science and Technology of China, 2008