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Electron-electron interactions in non-equilibrium bilayer graphene
Wei-Zhe Liu, Allan H. MacDonald, Dimitrie Culcer
Conducting steady-states of doped bilayer graphene have a non-zero sublattice pseudospin polarization. Electron-electron interactions renormalize this polarization even at zero tem…
Photoemission spectra of massless Dirac fermions on the verge of exciton condensation
Stefan Rist, A. A. Varlamov, A. H. MacDonald +2
Angle-resolved photoemission spectroscopy (ARPES) is a powerful probe of electron correlations in two-dimensional layered materials. In this Letter we demonstrate that ARPES can be…
Quantized Casimir Force
Wang-Kong Tse, A. H. MacDonald
We investigate the Casimir effect between two-dimensional electron systems driven to the quantum Hall regime by a strong perpendicular magnetic field. In the large separation (d) l…
Gapped broken symmetry states in ABC trilayer graphene
Jeil Jung, Allan H. MacDonald
We use a self-consistent Hartree-Fock approximation with realistic Coulomb interactions for -band electrons to explore the possibility of broken symmetry states in weakly disord…
Drude weight, cyclotron resonance, and the Dicke model of graphene cavity QED
Luca Chirolli, Marco Polini, Vittorio Giovannetti +1
The Dicke model of cavity quantum electrodynamics is approximately realized in condensed matter when the cyclotron transition of a two-dimensional electron gas is nearly resonant w…
Strong Coulomb drag and broken symmetry in double-layer graphene
R. V. Gorbachev, A. K. Geim, M. I. Katsnelson +7
Spatially separated electron systems remain strongly coupled by electron-electron interactions even when they cannot exchange particles, provided that the layer separation d is com…
Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
Alexander B. Khanikaev, S. Hossein Mousavi, Wang-Kong Tse +3
Recent progress in understanding the topological properties of condensed matter has led to the discovery of time-reversal invariant topological insulators. Because of limitations i…
Transport Properties of Graphene Nanoroads in Boron-Nitride Sheets
Jeil Jung, Zhenhua Qiao, Qian Niu +1
We demonstrate that the one-dimensional (1D) transport channels that appear in the gap when graphene nanoroads are embedded in boron-nitride (BN) sheets are more robust when they a…
Interaction-Enhanced Coherence Between Two-Dimensional Dirac Layers
Inti Sodemann, D. A. Pesin, A. H. MacDonald
We estimate the strength of interaction-enhanced coherence between two graphene or topological insulator surface-state layers by solving imaginary-axis gap equations in the random…
Visualizing landscapes of the superconducting gap in heterogeneous superconductor thin films: geometric influences on proximity effects
Jungdae Kim, Victor Chua, Gregory A. Fiete +3
The proximity effect is a central feature of superconducting junctions as it underlies many important applications in devices and can be exploited in the design of new systems with…
Minimum Conductivity and Evidence for Phase Transitions in Ultra-clean Bilayer Graphene
Wenzhong Bao, Jairo Velasco, Fan Zhang +6
Bilayer graphene (BLG) at the charge neutrality point (CNP) is strongly susceptible to electronic interactions, and expected to undergo a phase transition into a state with spontan…
Pseudospin Transfer Torques in Semiconductor Electron Bilayers
Youngseok Kim, Allan H. MacDonald, Matthew J. Gilbert
We use self-consistent quantum transport theory to investigate the influence of electron-electron interactions on interlayer transport in semiconductor electron bilayers in the abs…
Hund's Rules for the N=0 Landau Levels of Trilayer Graphene
Fan Zhang, Dagim Tilahun, Allan H. MacDonald
The N=0 Landau levels of ABC and ABA trilayer graphene both have approximate 12-fold degeneracies that are lifted by interactions to produce strong quantum Hall effects (QHE) at al…
Density, spin, and pairing instabilities in polarized ultracold Fermi gases
Inti Sodemann, D. A. Pesin, A. H. MacDonald
We study the influence of population imbalance on the pairing, spin, and density instabilities of a two component ideal Fermi gas after a sudden quench of interactions near a Feshb…
Quantum Kinetic Theory of Current-Induced Torques in Rashba Ferromagnets
D. A. Pesin, A. H. MacDonald
Motivated by recent experimental studies of thin-film devices containing a single ferromagnetic layer, we develop a quantum kinetic theory of current-induced magnetic torques in Ra…