256 citations · 3.4k across the 55 of their papers we have counts for
28 papers · 1 filter
Weak localization as a probe of intervalley coherence in graphene multilayers
Nemin Wei, Yongxin Zeng, A. H. MacDonald
Spontaneous intervalley coherence is suspected in several different graphene multilayer systems, but is difficult to confirm because of a paucity of convenient experimental signatu…
Moiré Commensurability and the Quantum Anomalous Hall Effect in Twisted Bilayer Graphene on Hexagonal Boron Nitride
Jingtian Shi, Jihang Zhu, A. H. MacDonald
The quantum anomalous Hall (QAH) effect is sometimes observed in twisted bilayer graphene (tBG) when it is nearly aligned with an encapsulating hexagonal boron nitride (hBN) layer.…
Weak-field Hall Resistivity and Spin/Valley Flavor Symmetry Breaking in Magic-Angle Twisted Bilayer Graphene
Ming Xie, Allan H. MacDonald
Near a magic twist angle, the lowest energy conduction and valence bands of bilayer graphene moiré superlattices become extremely narrow. The band dispersion that remains is sensit…
Topological Quantum Computing Using Nanowire Devices
C. Tutschku, R. W. Reinthaler, C. Lei +2
The boundary of topological superconductors might lead to the appearance of Majorana edge modes, whose non-trivial exchange statistics can be used for topological quantum computing…
Microscopic Theory of Equilibrium Polariton Condensates
Fei Xue, Fengcheng Wu, Ming Xie +2
We present a microscopic theory of the equilibrium polariton condensate state of a semiconductor quantum well in a planar optical cavity. The theory accounts for the adjustment of…
SU(3) Quantum Hall Ferromagnetism in SnTe
Xiao Li, Fan Zhang, A. H. MacDonald
The (111) surface of SnTe hosts one isotropic -centered and three degenerate anisotropic - centered Dirac surface states. We predict that a nematic phase with spont…
Stacking dependence of carrier-interactions in multilayer graphene systems
Yunsu Jang, E. H. Hwang, A. H. MacDonald +1
We identify qualitative trends in the stacking sequence dependence of carrier-carrier interaction phenomena in multilayer graphene. Our theory is based on a new approach which expl…
Impurity cyclotron resonance of anomalous Dirac electrons in graphene
S. C. Kim, S. -R. Eric Yang, A. H. MacDonald
We have investigated a new feature of impurity cyclotron resonances common to various localized potentials of graphene. A localized potential can interact with a magnetic field in…
Spontaneous Layer-Pseudospin Domain Walls in Bilayer Graphene
Xiao Li, Fan Zhang, Qian Niu +1
Bilayer graphene is susceptible to a family of unusual broken symmetry states with spin and valley dependent layer polarization. We report on a microscopic study of the domain wall…
Optical conductivity of the two-dimensional electron gas
Ming Xie, Guru Khalsa, A. H. MacDonald
Motivated by recent interest in perovskite surfaces and heterostructures, we present an analysis of the Kubo conductivity of a two-dimensional electron gas (2DEG) formed in the $t_…
Topological Magneto-Electric Effect Decay
D. A. Pesin, A. H. MacDonald
We address the influence of realistic disorder on the effective magnetic monopole that is induced near the surface of an ideal topological insulator (TI) by azimuthal currents whic…
Pseudospin Order in Monolayer, Bilayer, and Double-Layer Graphene
Allan H. MacDonald, Jeil Jung, Fan Zhang
Graphene is a gapless semiconductor in which conduction and valence band wavefunctions differ only in the phase difference between their projections onto the two sublattices of the…
Transport in Coherent Quantum Hall Bilayers
D. A. Pesin, A. H. MacDonald
We discuss two phenomenological descriptions of low-current transport in bilayer quantum Hall system with exciton condensates, one based on a Landauer-Buttiker description of Andre…
Moire Butterflies
R. Bistritzer, A. H. MacDonald
The Hofstadter butterfly spectral patterns of lattice electrons in an external magnetic field yield some of the most beguiling images in physics. Here we explore the magneto-electr…
Chern number spins of Mn acceptor magnets in GaAs
T. O. Strandberg, C. M. Canali, A. H. MacDonald
We determine the effective total spin of local moments formed from acceptor states bound to Mn ions in GaAs by evaluating their magnetic Chern numbers. We find that when indivi…
Electron-electron interactions in decoupled graphene layers
Rosario E. V. Profumo, Marco Polini, Reza Asgari +2
Multi-layer graphene on the carbon face of silicon carbide is an intriguing electronic system which typically consists of a stack of ten or more layers. Rotational stacking faults…
Orbital order in bilayer graphene at filling factor
R. Côté, Jules Lambert, Yafis Barlas +1
In a graphene bilayer with Bernal stacking both and orbital Landau levels have zero kinetic energy. An electronic state in the N=0 Landau level consequently has three q…
Carrier Density and Magnetism in Graphene Zigzag Nanoribbons
J. Jung, A. H. MacDonald
The influence of carrier density on magnetism in a zigzag graphene nanoribbon is studied in a -orbital Hubbard-model mean-field approximation. Departures from half-filling alter…
Finite-temperature Screening and the Specific Heat of Doped Graphene Sheets
M. R. Ramezanali, M. M. Vazifeh, Reza Asgari +2
At low energies, electrons in doped graphene sheets are described by a massless Dirac fermion Hamiltonian. In this work we present a semi-analytical expression for the dynamical de…
Electronic structure of multilayer graphene
Hongki Min, A. H. MacDonald
We study the electronic structure of multilayer graphene using a -orbital continuum model with nearest-neighbor intralayer and interlayer tunneling. Using degenerate state pertu…
Effect of Edge Roughness on Electronic Transport in Graphene Nanoribbon Channel Metal Oxide Semiconductor Field-Effect Transistors
D. Basu, M. J. Gilbert, L. F. Register +2
Results of quantum mechanical simulations of the influence of edge disorder on transport in graphene nanoribbon metal oxide semiconductor field-effect transistors (MOSFETs) are rep…
Current-induced torques due to compensated antiferromagnets
Paul M. Haney A. H. MacDonald
We analyse the influence of current induced torques on the magnetization configuration of a ferromagnet in a circuit containing a compensated antiferromagnet. We argue that these t…
Ab-initio GMR and current-induced torques in Au/Cr multilayers
P. M. Haney, D. Waldron, R. A. Duine +3
We report on an {\em ab-initio} study of giant magnetoresistance (GMR) and current-induced-torques (CITs) in Cr/Au multilayers that is based on non-equilibrium Green's functions an…
Charge and spin Hall conductivity in metallic graphene
N. A. Sinitsyn, J. E. Hill, Hongki Min +2
Graphene has an unusual low-energy band structure with four chiral bands and half-quantized and quantized Hall effects that have recently attracted theoretical and experimental att…