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Electron-Hole Asymmetric Integer and Fractional Quantum Hall Effect in Bilayer Graphene
Angela Kou, Benjamin E. Feldman, Andrei J. Levin +4
The nature of fractional quantum Hall (FQH) states is determined by the interplay between the Coulomb interaction and the symmetries of the system. The unique combination of spin,…
Screening Charged Impurities and Lifting the Orbital Degeneracy in Graphene by Populating Landau Levels
Adina Luican-Mayer, Maxim Kharitonov, Guohong Li +7
We report the observation of an isolated charged impurity in graphene and present direct evidence of the close connection between the screening properties of a 2D electron system a…
Gate dependent Raman spectroscopy of graphene on hexagonal boron nitride
Kanokporn Chattrakun, Shengqiang Huang, K. Watanabe +3
Raman spectroscopy, a fast and nondestructive imaging method, can be used to monitor the doping level in graphene devices. We fabricated chemical vapor deposition (CVD) grown graph…
Etched graphene quantum dots on hexagonal boron nitride
S. Engels, A. Epping, C. Volk +6
We report on the fabrication and characterization of etched graphene quantum dots (QDs) on hexagonal boron nitride (hBN) and SiO2 with different island diameters. We perform a stat…
Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state
A. F. Young, J. D. Sanchez-Yamagishi, B. Hunt +5
Low-dimensional electronic systems have traditionally been obtained by electrostatically confining electrons, either in heterostructures or in intrinsically nanoscale materials suc…
Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
B. Hunt, J. D. Sanchez-Yamagishi, A. F. Young +6
Van der Waals heterostructures comprise a new class of artificial materials formed by stacking atomically-thin planar crystals. Here, we demonstrate band structure engineering of a…