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 article, the quasiparticle spectra of the Hubbard model on the anisotropic triangle lattice at half filling were studied using the cluster perturbation theory and applied to the organic superconductor kappa-(BEDT-TTF)(2)X.
Abstract: The quasiparticle spectra of the Hubbard model on the anisotropic triangle lattice at half filling is studied using the cluster perturbation theory and applied to the organic superconductor kappa-(BEDT-TTF)(2)X. We find that a d(x2-y2)-wave-like pseudogap phase emerges in the intermediate-coupling regime. Near the critical line of the Mott insulating transition, the Fermi surface becomes segmented with a Fermi arc, due to the partial opening of the Mott gap along the Fermi surface. The pseudogap with the Fermi arc is shown to be a precursor to the Mott insulator.
17 citations
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TL;DR: In this article, a critical consideration of some approaches to the metal-insulator transition problem, starting from the many-electron representation, is carried out within the framework of the Hubbard and classical s-d models in the far-paramagnetic region.
Abstract: A critical consideration of some approaches to the metal-insulator transition problem, starting from the many-electron representation, is carried out within the framework of the Hubbard and classical s-d models in the far-paramagnetic region. The analytical properties of the corresponding one-electron Green functions are discussed, the importance of terms of sufficiently high orders in l/z being demonstrated. The total energy, electronic specific heat and corrections to the local moment are calculated. The Hubbard-III approximation in the Hubbard model (but not in the s-d model) is shown to lead to difficulties when calculating thermodynamic properties.
17 citations
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TL;DR: In this paper, the spin stiffness is found to vanish at $U\ensuremath{\approx}6$ due to competing spin couplings generated at finite $U$ and the loss of magnetic order due to divergent quantum fluctuations yields a magnetic quantum phase transition in the insulating state at
Abstract: The 120\ifmmode^\circ\else\textdegree\fi{} ordered antiferromagnetic state of the Hubbard model on a triangular lattice presents an interesting case of $U$-controlled competing interactions and frustration. The spin stiffness is found to vanish at $U\ensuremath{\approx}6$ due to competing spin couplings generated at finite $U$. The loss of magnetic order due to divergent quantum fluctuations yields a magnetic quantum phase transition in the insulating state at $U\ensuremath{\gtrsim}6$. Implications of the quantum spin disordered insulator to the spin-liquid state and Mott transition in the organic systems $\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}X$ are discussed. Effects of hole and electron doping on magnetic ordering and spin stiffness are also examined.
17 citations
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TL;DR: In this article, a broadening of the top of the phase diagram with gas densities at least a factor of 3 lower than expected in the region near the Mott density was observed.
Abstract: Spectroscopic measurements of the electron-hole fluid in Ge indicate that the liquid-gas phase diagram is distroted from that of simple fluids. This Mott distortion appears as a broadening of the top of the phase diagram with gas densities at least a factor of 3 lower than expected in the region near the Mott density. The precise shape of the phase boundary in the high-density gas remains uncertain because of inadequacies in our theoretical and experimental understanding of screening effects at finite temperatures. However, no first-order Mott transition separate from the liquid-gas transition is found to occur.
17 citations
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TL;DR: In this article, a conventional method of statistical physics and quantum mechanics is used to calculate the effective area and the expansion energy for trapped Bose gas in a combined optical-magnetic potential.
17 citations