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Excitonic condensation of massless fermions in graphene bilayers
C. -H. Zhang, Yogesh N. Joglekar
Graphene, a single sheet of graphite with honeycomb lattice structure, has massless carriers with tunable density and polarity. We investigate the ground state phase diagram of two…
Influence of Landau-level mixing on Wigner crystallization in graphene
C. -H. Zhang, Yogesh N. Joglekar
Graphene, with its massless linearly-dispersing carriers, in the quantum Hall regime provides an instructive comparison with conventional two-dimensional (2D) systems in which carr…
Supersolid of indirect excitons in electron-hole quantum Hall systems
C. -H. Zhang, Yogesh N. Joglekar
We investigate the ground state of a balanced electron-hole system in the quantum Hall regime using mean-field theory and obtain a rich phase diagram as a function of interlayer di…
Wigner crystal and bubble phases in graphene in the quantum Hall regime
C. -H. Zhang, Yogesh N. Joglekar
Graphene, a single free-standing sheet of graphite with honeycomb lattice structure, is a semimetal with carriers that have linear dispersion. A consequence of this dispersion is t…
Single-particle and Interaction Effects on the Cohesion and Transport and Magnetic Properties of Metal Nanowires at Finite Voltages
C. -H. Zhang
The single-particle and interaction effects on the cohesion, electronic transport, and some magnetic properties of metallic nanocylinders have been studied at finite voltages by us…
Superfluidity without Symmetry-Breaking: The Time-Dependent Hartree-Fock Approximation for Bose-Condensed Systems
C. -H. Zhang, H. A. Fertig
We develop a time-dependent Hartree-Fock approximation that is appropriate for Bose-condensed systems. Defining a {\it depletion Green's function} allows the construction of conden…