4.8k citations · 54.9k across the 353 of their papers we have counts for
21 papers · 1 filter
Tunneling density of states, correlation energy, and spin polarization in the fractional quantum Hall regime
Gaurav Chaudhary, Dmitry K. Efimkin, Allan H. MacDonald
We derive exact sum-rules that relate the tunneling density of states (TDOS) of spinful electrons in the fractional quantum Hall (FQH) regime to the spin-dependent many body ground…
Energy-resolved Photoconductivity Mapping in a Monolayer-bilayer WSe2 Lateral Heterostructure
Zhaodong Chu, Ali Han, Chao Lei +10
Vertical and lateral heterostructures of van der Waals materials provide tremendous flexibility for band structure engineering. Since electronic bands are sensitively affected by d…
Accurate Gap Determination in Monolayer and Bilayer Graphene/h-BN Moire Superlattices
Hakseong Kim, Nicolas Leconte, Bheema L. Chittari +5
High mobility single and few-layer graphene sheets are in many ways attractive as nanoelectronic circuit hosts but lack energy gaps, which are essential to the operation of field-e…
Moiré Excitons in Van der Waals Heterostructures
Kha Tran, Galan Moody, Fengcheng Wu +19
In van der Waals (vdW) heterostructures formed by stacking two monolayer semiconductors, lattice mismatch or rotational misalignment introduces an in-plane moiré superlattice. Whil…
Topological insulators in twisted transition metal dichalcogenide homobilayers
Fengcheng Wu, Timothy Lovorn, Emanuel Tutuc +2
We show that moiré bands of twisted homobilayers can be topologically nontrivial, and illustrate the tendency by studying valence band states in valleys of twisted bilayer…
Chiral transport and electronic correlations in surface states of HfNiSn single crystals
L. Steinke, J. J. Kistner-Morris, T. F. Lovorn +9
In most topological insulators, the valence and conduction band appear in reverse or inverted order compared to an equivalent insulator with isolated atoms. Here, we explore a diff…
Ferroelectric quantum Hall phase revealed by visualizing Landau level wavefunction interference
Mallika T. Randeria, Benjamin E. Feldman, Fengcheng Wu +6
Novel broken symmetry states can spontaneously form due to Coulomb interactions in electronic systems with multiple internal degrees of freedom. Multi-valley materials offer an esp…
Theory of phonon-mediated superconductivity in twisted bilayer graphene
Fengcheng Wu, A. H. MacDonald, Ivar Martin
We present a theory of phonon-mediated superconductivity in near magic angle twisted bilayer graphene. Using a microscopic model for phonon coupling to moiré band electrons, we fin…
Electronic properties of thin films of tensile strained HgTe
Jihang Zhu, Chao Lei, Allan H. MacDonald
Tensile strained bulk HgTe is a three-dimensional topological insulator. Because of the energetic position of its surface state Dirac points relative to its small bulk gap, the ele…
Hubbard model physics in transition metal dichalcogenide moiré bands
Fengcheng Wu, Timothy Lovorn, Emanuel Tutuc +1
Flexible long period moir\' e superlattices form in two-dimensional van der Waals crystals containing layers that differ slightly in lattice constant or orientation. In this Letter…
Helical Network Model for Twisted Bilayer Graphene
Dmitry K. Efimkin, Allan H. MacDonald
In the presence of a finite interlayer displacement field bilayer graphene has an energy gap that is dependent on stacking and largest for the stable AB and BA stacking arrangement…
Observation of Rydberg exciton polaritons and their condensate in a perovskite cavity
Wei Bao, Xiaoze Liu, Fei Xue +13
The condensation of half-light half-matter exciton polaritons in semiconductor optical cavities is a striking example of macroscopic quantum coherence in a solid state platform. Qu…
Valley-Dependent Magnetoresistance in Two-Dimensional Semiconductors
Akihiko Sekine, Allan H. MacDonald
We show theoretically that two-dimensional direct-gap semiconductors with a valley degree of freedom, including monolayer transition-metal dichalcogenides and gapped bilayer graphe…
Spin Hall effects without spin currents in magnetic insulators
Hua Chen, Qian Niu, Allan H. MacDonald
The spin Hall effect (SHE) is normally discussed in terms of a spin current, which is ill-defined in strongly spin-orbit-coupled systems because of spin non-conservation. In this w…
Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe heterostructures
G. William Burg, Nitin Prasad, Kyounghwan Kim +5
We report the experimental observation of strongly enhanced tunneling between graphene bilayers through a WSe barrier when the graphene bilayers are populated with carriers of…
Manipulating Anomalous Hall Antiferromagnets with Magnetic Fields
Hua Chen, Tzu-Cheng Wang, Di Xiao +3
The symmetry considerations that imply a non-zero anomalous Hall effect (AHE) in certain non-collinear antiferromagnets also imply both non-zero orbital magnetization and a net spi…
Topologically Protected Helical States in Minimally Twisted Bilayer Graphene
Shengqiang Huang, Kyounghwan Kim, Dmitry K. Efimkin +6
In minimally twisted bilayer graphene, a moir{é} pattern consisting of AB and BA stacking regions separated by domain walls forms. These domain walls are predicted to support count…
Long-Distance Spin Transport Through a Graphene Quantum Hall Antiferromagnet
Petr Stepanov, Shi Che, Dmitry Shcherbakov +11
Antiferromagnetic insulators (AFMI) are robust against stray fields, and their intrinsic dynamics could enable ultrafast magneto-optics and ultrascaled magnetic information process…
Tunable Valley Populations in Hole-Doped Trilayer WSe
Hema C. P. Movva, Timothy Lovorn, Babak Fallahazad +7
We present a combined experimental and theoretical study of valley populations in the valence bands of trilayer WSe. Shubnikovde Haas oscillations show that trilayer holes p…
Anatomy of magnetic anisotropy induced by Rashba spin-orbit interactions
Gaurav Chaudhary, Manuel dos Santos Dias, Allan H. MacDonald +1
Magnetic anisotropy controls the orientational stability and switching properties of magnetic states, and therefore plays a central role in spintronics. First-principles density-fu…
Ultrathin Films of Superconducting Metals as a Platform for Topological Superconductivity
Chao Lei, Hua Chen, Allan H. MacDonald
The ingredients normally required to achieve topological superconductivity (TSC) are Cooper pairing, broken inversion symmetry, and broken time-reversal symmetry. We present a theo…