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Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Hongki Min, A. H. MacDonald
We show that the origin of the universal optical conductivity in a normal -layer graphene multilayer is an emergent chiral symmetry which guarantees that in both…
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…
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…
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…
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…