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Half-filled 2D bilayers in a strong magnetic field: Revisiting the fractional quantum Hall effect
S. Das Sarma, Michael R. Peterson
We examine the quantum phase diagram of the fractional quantum Hall effect in the lowest Landau level in half-filled bilayer structures as a function of tunneling strength and laye…
The enigma of the nu=0 quantum Hall effect in graphene
S. Das Sarma, Kun Yang
We apply Laughlin's gauge argument to analyze the quantum Hall effect observed in graphene when the Fermi energy lies near the Dirac point, and conclude that this necessarily…
Splitting of Majorana modes due to intervortex tunneling in a p + ip superconductor
Meng Cheng, Roman M. Lutchyn, Victor Galitski +1
We consider a two-dimensional px+i py superconductor in the presence of multiple vortices, which support zero-energy Majorana fermion states in their cores. Intervortex tunnelings…
Pure quantum dephasing of a solid state electron spin qubit in a large nuclear spin bath coupled by long-range hyperfine-mediated interactions
L. Cywinski, W. M. Witzel, S. Das Sarma
We investigate decoherence due to pure dephasing of a localized spin qubit interacting with a nuclear spin bath. Although in the limit of a very large magnetic field the only decoh…
Collective modes of the massless Dirac plasma
S. Das Sarma, E. H. Hwang
We develop a theory for the long-wavelength plasma oscillation of a collection of charged massless Dirac particles in a solid, as occurring for example in doped graphene layers, in…
Topological Insulators and Metals in Atomic Optical Lattices
Tudor D. Stanescu, Victor Galitski, J. Y. Vaishnav +2
We propose the realization of topological quantum states with cold atoms trapped in an optical lattice. We discuss an experimental setup that generates a two-dimensional hexagonal…