Topic
Mott transition
About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.
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TL;DR: In this paper, the Hartree-Fock dielectric function is used with the inclusion of exchange and correlation effects to investigate the metal-insulator transition in a many-valley semiconductor system.
2 citations
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2 citations
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TL;DR: In this paper, the half-filled Hubbard model on the checkerboard lattice was applied to the Mott insulating phase of the electron system, and it was shown that virtual electronic processes that generate longer range and multispin couplings lift the degeneracy, selecting a "flux like" state in the mott insulator, and a sharp crossover from this state to a '120 degree' correlated state and then a paramagnet.
Abstract: The checkerboard lattice, with alternating 'crossed' plaquettes, serves as the two dimensional analog of the pyrochlore lattice. The corner sharing plaquette structure leads to a hugely degenerate ground state, and no magnetic order, for classical spins with short range antiferromagnetic interaction. For the half-filled Hubbard model on this structure, however, we find that the Mott insulating phase involves virtual electronic processes that generate longer range and multispin couplings. These couplings lift the degeneracy, selecting a 'flux like' state in the Mott insulator. Increasing temperature leads, strangely, to a sharp crossover from this state to a '120 degree' correlated state and then a paramagnet. Decrease in the Hubbard repulsion drives the system towards an insulator-metal transition-the moments reduce, and a spin disordered state wins over the flux state. Near the insulator-metal transition the electron system displays a pseudogap extending over a large temperature window.
2 citations
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TL;DR: In this paper, the luminescence spectra from compressed electron-hole plasma in pure germanium were studied and a satisfactory thermalization of the charge carriers was shown to lead to a reasonable value of the compressibility.
2 citations
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12 Aug 2013TL;DR: In this paper, the authors derived the extended Hubbard model with the hopping terms of each species modified to include interaction effects and demonstrated the Bosonic Mott transition induced by introducing fermions into bosons.
Abstract: Bose-Fermi mixtures with attractive Bose-Fermi interactions in one-dimensional optical lattices are studied by using Quantum Monte Carlo simulations of an extended Bose-Fermi Hubbard model. We first derived the extended Hubbard model with the hopping terms of each species modified to include interaction effects. Bosonic Mott transition induced by introducing fermions into bosons is demonstrated by the simulations.
2 citations