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Ab-Initio Theory of Moiré Superlattice Bands in Layered Two-Dimensional Materials
Jeil Jung, Arnaud Raoux, Zhenhua Qiao +1
When atomically thin two-dimensional (2D) materials are layered they often form incommensurate non-crystalline structures that exhibit long-period moir{\' e} patterns when examined…
Accurate tight-binding and continuum models for the bands of bilayer graphene
Jeil Jung, Allan H. MacDonald
We derive an {\em ab initio} -band tight-binding model for stacked bilayer graphene based on maximally localized Wannier wave functions (MLWFs) centered on the carbon sites…
Anomalous Hall effect arising from noncollinear antiferromagnetism
Hua Chen, Qian Niu, A. H. MacDonald
In most conductors current flow perpendicular to electric field direction (Hall current) can be explained in terms of the Lorentz forces present when charged particles flow in an e…
Spintronics and Pseudospintronics in Graphene and Topological Insulators
D. A. Pesin, A. H. MacDonald
The two-dimensional electron systems in graphene and in topological insulators are described by massless Dirac equations. Although the two systems have similar Hamiltonians, they a…
Theory of Native Orientational Pinning in Quantum Hall Nematics
Inti Sodemann, Allan H. MacDonald
The orientation of the electron-nematic states discovered in the quantum Hall regime of GaAs growth-direction quantum wells is pinned by a weak native source of anisotropy.…
Photonic density of states enhancement in finite graphene multilayers
Ashley M DaSilva, You-Chia Chang, Ted Norris +1
We consider the optical properties of finite systems composed of a series of graphene sheets separated by thin dielectric layers. Because these systems respond as conductors to ele…
Shubnikov-de Haas effect in low electron density SrTiO3: Conduction band edge of SrTiO3 redux
S James Allen, Bharat Jalan, SungBin Lee +5
The Shubnikov-de Haas effect is used to explore the conduction band edge of high mobility SrTiO3 films doped with La. The results largely confirm the earlier measurements by Uwe et…
Current partition at topological zero-line intersections
Zhenhua Qiao, Jeil Jung, Chungwei Lin +2
An intersection between one-dimensional chiral acts as a topological current splitter. We find that the splitting of a chiral zero-line mode obeys very simple, yet highly counterin…
Landau Level Mixing and the Fractional Quantum Hall Effect
Inti Sodemann, A. H. MacDonald
We derive effective Hamiltonians for the fractional quantum Hall effect in n=0 and n=1 Landau levels that account perturbatively for Landau level mixing by electron-electron intera…
Gate-Tunable Exchange Coupling Between Cobalt Clusters on Graphene
Hua Chen, Qian Niu, Zhenyu Zhang +1
We use spin-density-functional theory (SDFT) ab initio calculations to theoretically explore the possibility of achieving useful gate control over exchange coupling between cobalt…
Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
Fan Zhang, A. H. MacDonald, E. J. Mele
Electronic states at domain walls in bilayer graphene are studied by analyzing their four and two band continuum models, by performing numerical calculations on the lattice, and by…
Theory of t2g electron-gas Rashba interactions
Guru Khalsa, Byounghak Lee, A. H. MacDonald
The spin-degeneracy of Bloch bands in a crystal can be lifted when spin-orbit (SO) coupling is present and inversion symmetry is absent. In two-dimensional electron systems (2DES)…