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Non-Adiabatic Spin Transfer Torque in Real Materials
Ion Garate, K. Gilmore, M. D. Stiles +1
The motion of simple domain walls and of more complex magnetic textures in the presence of a transport current is described by the Landau-Lifshitz-Slonczewski (LLS) equations. Pred…
Comment on "Electron screening and excitonic condensation in double-layer graphene systems"
R. Bistritzer, H. Min, J. J. Su +1
The influence of screening on the condensed state of bilayer graphene is studied within the framework of the Thomas Fermi approximation. We find that screening has little effect on…
Quantum Wells in Polar-Nonpolar Oxide Heterojunction Systems
C. -C Joseph Wang, Bhagawan Sahu, Hongki Min +2
We address the electronic structure of quantum wells in polar-nonpolar oxide heterojunction systems focusing on the case of non-polar BaVO wells surrounded by polar LaTiO b…
Gilbert Damping in Conducting Ferromagnets II: Model Tests of the Torque-Correlation Formula
Ion Garate, Allan MacDonald
We report on a study of Gilbert damping due to particle-hole pair excitations in conducting ferromagnets. We focus on a toy two-band model and on a four-band spherical model which…
Gilbert Damping in Conducting Ferromagnets I: Kohn-Sham Theory and Atomic-Scale Inhomogeneity
Ion Garate, Allan H. MacDonald
We derive an approximate expression for the Gilbert damping coefficient α_G of itinerant electron ferromagnets which is based on their description in terms of spin-density-function…
Influence of Disorder on Electron-Hole Pair Condensation in Graphene Bilayers
R. Bistritzer, A. H. MacDonald
Graphene bilayers can condense into a state with spontaneous interlayer phase coherence that supports dissipationless counterflow supercurrents. Here we address the influence of di…
ARPES, Neutrons, and the High- Mechanism
Wei-Cheng Lee, A. H. MacDonald
Extensive ARPES and low-energy inelastic neutron scattering studies of cuprate superconductors can be successfully described using a weak-coupling theory in which quasiparticles on…
Density-Functional Theory of Graphene Sheets
Marco Polini, Andrea Tomadin, Reza Asgari +1
We outline a Kohn-Sham-Dirac density-functional-theory (DFT) scheme for graphene sheets that treats slowly-varying inhomogeneous external potentials and electron-electron interacti…
Theory of Graphene Chiral Quasiparticle LDOS maps
T. Pereg-Barnea, A. H. MacDonald
We present a theory of momentum space local density-of-states (LDOS) maps N(q,omega) in graphene. The LDOS map has both intravalley contributions centered near zero momentum and re…
Intra-Landau level Cyclotron Resonance in Bilayer Graphene
Yafis Barlas, R. Cote, K. Nomura +1
Interaction driven integer quantum Hall effects are anticipated in graphene bilayers because of the near-degeneracy of the eight Landau levels which appear near the neutral system…
Room-Temperature Superfluidity in Graphene Bilayers
Hongki Min, Rafi Bistritzer, Jung-Jung Su +1
Because graphene is an atomically two-dimensional gapless semiconductor with nearly identical conduction and valence bands, graphene-based bilayers are attractive candidates for hi…
How to make a bilayer exciton condensate flow
Jung-Jung Su, A. H. MacDonald
Bose condensation is responsible for many of the most spectacular effects in physics because it can promote quantum behavior from the microscopic to the macroscopic world. Bose con…
Energy gaps, magnetism, and electric field effects in bilayer graphene nanoribbons
Bhagawan Sahu, Hongki Min, Allan. H. MacDonald +1
Using a first principles density functional electronic structure method, we study the energy gaps and magnetism in bilayer graphene nanoribbons as a function of the ribbon width an…