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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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Book ChapterDOI
01 Jan 1985
TL;DR: In this paper, the Mott transition in conventional three dimensional semi-conductors is conceptually understood in the context of the concept of the insulator-metal transition, and the localized donor or acceptor states of the dilute limit evolve into "metallic" impurity bands when the wave-function overlap is sufficient to give effective screening of the localizing electronelectron interaction.
Abstract: The insulator-metal transition in conventional three dimensional semi-conductors is conceptually understood in the context of. the Mott transition. The localized donor or acceptor states of the dilute limit evolve into “metallic” impurity bands when the wave-function overlap is sufficient to give effective screening of the localizing electronelectron interaction.
Posted ContentDOI
16 Jul 2022
TL;DR: In this paper , the authors used the dynamical cluster approximation with continuous time auxiliary field quantum Monte Carlo to solve the Mott transition in the triangular lattice at half-filling model.
Abstract: The Mott transition is observed experimentally in materials that are magnetically frustrated so that long-range order does not hide the Mott transition at finite temperature. The Hubbard model on the triangular lattice at half-filling is a paradigmatic model to study the interplay of interactions and frustration on the normal-state phase diagram. We use the dynamical cluster approximation with continuous time auxiliary field quantum Monte Carlo to solve this model for 1, 4, 6, 12, and 16 site clusters with detailed analysis performed for the 6 site cluster. We show that a) for every cluster there is an inflection point in the double occupancy as a function of interaction, defining a Widom line that extends above the critical point of the first-order Mott transition; b) the presence of this line and the cluster size dependence argue for the observability of the Mott transition at finite temperature in the thermodynamic limit; c) the loss of spectral weight in the metal to Mott insulator transition as a function of temperature and for strong interactions is momentum dependent, the hallmark of a pseudogap. That pseudogap spans a large region of the phase diagram near the Mott transition.
Journal ArticleDOI
TL;DR: In this paper, it was shown that high temperature superconductivity (SC) in A3C60 compounds can be attributed to a BCS mechanism, with a weak incidence of electron correlations.
Abstract: The discovery in 1991 of high temperature superconductivity (SC) in A3C60 compounds, where A is an alkali ion, has been initially ascribed to a BCS mechanism, with a weak incidence of electron correlations. However various experimental evidences taken for compounds with distinct alkali content established the interplay of strong correlations and Jahn Teller distortions of the C60 ball. The importance of electronic correlations even in A3C60 has been highlighted by the recent discovery of two expanded fulleride Cs3C60 isomeric phases that are Mott insulators at ambient pressure. Both phases undergo a pressure induced first order Mott transition to SC with a (p, T) phase diagram displaying a dome shaped SC, a common situation encountered nowadays in correlated electron systems. NMR experiments allowed us to establish that the bipartite A15 phase displays N\'eel order at 47K, while magnetic freezing only occurs at lower temperature in the fcc phase. NMR data do permit us to conclude that well above the critical pressure, the singlet superconductivity found for light alkalis is recovered. However deviations from BCS expectations linked with electronic correlations are found near the Mott transition. So, although SC involves an electron-phonon mechanism, correlations have a significant incidence on the electronic properties, as had been anticipated from DMFT calculations.
Journal ArticleDOI
TL;DR: In this paper, the magneto-resistance, upper critical field and thermally activated flux mechanism of superconductor Mg-doped InN epitaxial film grown by Molecular Beam Epitaxy was investigated.
Abstract: The superconducting behaviour of InN has been observed in many experiments where the origin of superconductivity is addressed to presence of (i) In–In chains in ab-plane, (ii) specific carrier density range limited Mott transition critical carrier density and (iii) presence of In2O3 impurities. Although the superconductivity can be observed when the above conditions are enough for epitaxial grown InN films, the superconductivity properties of InN, so far, have not worked comprehensively. Here, we report the magneto-resistance, upper critical field and thermally activated flux mechanism of superconductor Mg doped InN epitaxial film grown by Molecular Beam Epitaxy. The superconducting phase transition temperature was observed at ~3.9 K at zero magnetic field. The carrier density of the film is found in the range of Mott transition and superconductivity to metal transition. The effect of magnetic field on the superconductivity of Mg-doped InN film is studied by employing the magnetoresistance and Hal...
Journal ArticleDOI
TL;DR: In this paper, the structure of 2D quantum electron-hole (e-h) plasmas was investigated using the direct path integral Monte Carlo method (PIMC) in a wide range of temperature, density and hole-to-electron mass ratio.
Abstract: We investigate structures of 2D quantum electron–hole (e–h) plasmas by the direct path integral Monte Carlo method (PIMC) in a wide range of temperature, density and hole-to-electron mass ratio. Our simulation includes a region of appearance and decay of the bound states (excitons and biexcitons), the Mott transition from the neutral e–h plasma to metallic-like clusters, formation from clusters of the hexatic-like liquid and formation of the crystal-like lattice.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202271
202165
202064
201968
201871