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Ab Initio Theory of Gate Induced Gaps in Graphene Bilayers
Hongki Min, B. R. Sahu, Sanjay K. Banerjee +1
We study the gate voltage induced gap that occurs in graphene bilayers using \textit{ab initio} density functional theory. Our calculations confirm the qualitative picture suggeste…
Current Induced Order Parameter Dynamics: Microscopic Theory Applied to Co/Cu/Co spin valves
P. M. Haney, D. Waldron, R. A. Duine +3
Transport currents can alter alter order parameter dynamics and change steady states in superconductors, in ferromagnets, and in hybrid systems. In this article we present a scheme…
Inelastic scattering in ferromagnetic and antiferromagnetic metal spintronics
R. A. Duine, P. M. Haney, A. S. Nunez +1
We use a ferromagnetic voltage probe model to study the influence of inelastic scattering on giant magnetoresistance and current-induced torques in ferromagnetic and antiferromagne…
Electronic transport through a double quantum dot in the spin blockade regime: Theoretical models
Jesus Inarrea, Gloria Platero, A. H. MacDonald
We analyzed the electronic transport through a double quantum dot in the spin blockade regime. Experiments of current rectification by Pauli exclusion principle in double quantum d…
Anomalous Hall effect in 2D Dirac band: link between Kubo-Streda formula and semiclassical Boltzmann equation approach
N. A. Sinitsyn, A. H. MacDonald, T. Jungwirth +2
The anomalous Hall effect (AHE) is a consequence of spin-orbit coupling in a ferromagnetic metal and is related primarily to density-matrix response to an electric field that is of…
FFLO Vortex Lattice States in Cold Fermionic-Atom Systems
Y. -P. Shim, R. A. Duine, A. H. MacDonald
Condensation of atom pairs with finite total momentum is expected in a portion of the phase diagram of a two-component fermionic cold-atom system. This unusual condensate can be id…
Thermally-Assisted Current-Driven Domain Wall Motion
R. A. Duine, A. S. Nunez, A. H. MacDonald
Starting from the stochastic Landau-Lifschitz-Gilbert equation, we derive Langevin equations that describe the nonzero-temperature dynamics of a rigid domain wall. We derive an exp…
Spin transfer in an antiferromagnet
Z. Wei, A. Sharma, A. S. Nunez +5
An electrical current can transfer spin angular momentum to a ferromagnet. This novel physical phenomenon, called spin transfer, offers unprecedented spatial and temporal control o…
Quantum transport of massless Dirac fermions in graphene
Kentaro Nomura, A. H. MacDonald
Motivated by recent graphene transport experiments, we have undertaken a numerical study of the conductivity of disordered two-dimensional massless Dirac fermions. Our results reve…
Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
Hongki Min, J. E. Hill, N. A. Sinitsyn +3
Starting from a microscopic tight-binding model and using second order perturbation theory, we derive explicit expressions for the intrinsic and Rashba spin-orbit interaction induc…
Collective Modes and Skyrmion Excitations in Graphene SU(4) Quantum Hall Ferromagnets
Kun Yang, S. Das Sarma, A. H. MacDonald
Graphene exhibits quantum Hall ferromagnetism in which an approximate SU(4) symmetry involving spin and valley degrees of freedom is spontaneously broken. We construct a set of int…
Theory of ferromagnetic (III,Mn)V semiconductors
T. Jungwirth, Jairo Sinova, J. Masek +2
The body of research on (III,Mn)V diluted magnetic semiconductors initiated during the 1990's has concentrated on three major fronts: i) the microscopic origins and fundamental phy…
Quantum Hall Ferromagnetism in Graphene
Kentaro Nomura, A. H. MacDonald
Graphene is a two-dimensional carbon material with a honeycomb lattice and Dirac-like low-energy excitations. When Zeeman and spin-orbit interactions are neglected its Landau level…