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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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TL;DR: In this paper, the authors used the doped Fullerenes as an example of how realistic systems can be described by simple models, starting from the band structure and setting up a tight-binding model that describes the t 1u conduction band.
Abstract: We use the doped Fullerenes as an example of how realistic systems can be described by simple models. Starting from the band structure we set up a tight-binding model that describes the t_{1u} conduction band. Adding correlation terms we arrive at a generalized Hubbard Hamiltonian that we treat using quantum Monte Carlo. To address the problem of superconductivity in the doped Fullerenes, we study the screening of a point charge. We find surprisingly efficient metallic screening even for strong correlations, almost up to the Mott transition, and discuss the implications on superconductivity, in particular the effect of the efficient screening on the Coulomb pseudopotential and the electron-phonon coupling.
TL;DR: In this article, the ammoniated alkali-metal fulleride (NH3)K3C60 is considered to be a narrow-band metal exhibiting a transition to an insulating ground state below ∼40 K.
Abstract: 13 C and 1 H-NMR measurements were carried out on the ammoniated alkali–metal fulleride (NH3)K3C60 which is considered to be a narrow-band metal exhibiting a transition to an insulating ground state below ∼40 K. 13 C −1/T 1 shows a remarkable drop associated with the opening of the energy gap just below ∼45 K. Appreciably broadened 13 C - and 1 H-NMR spectra were observed below 45 K, providing unambiguous evidence for three-dimensional (3D) antiferromagnetic (AF) order with a relatively large moment of ∼1μB/C60. It is suggested that the intercalation of NH3 makes (NH3)K3C60 a Mott–Hubbard-type AF ground state below T N ∼45 K .
TL;DR: In this paper, the effects of a repulsive three-body interaction on the Mott transition of the repulsively interacting three-component fermionic atoms in optical lattices were investigated by means of the self-energy functional approach.
Abstract: We investigate the effects of a repulsive three-body interaction on the Mott transition of the repulsively interacting three-component fermionic atoms in optical lattices by means of the self-energy functional approach. We find that the three-body repulsion hardly affects the qualitative features of the Mott transition, because the three-body repulsion does not compete with the two-body repulsions. When the three-body repulsion is extremely strong, the triple occupancy vanishes in the Fermi liquid state. This situation is equivalent to that caused by strong three-body losses. Our results imply that three-body losses have little influence on the Mott transitions in the repulsively interacting three-component fermionic atoms in optical lattices.
TL;DR: In this paper , a pressure-induced Mott transition from an antiferromagnetic Mott insulator to a ferromagnetic Weyl metal in the iron oxychalcogenide La 2 O 3 Fe 2 Se 2 occurs around 37 GPa without structural phase transition.
Abstract: Abstract The insulator-metal transition in Mott insulators, known as the Mott transition, is usually accompanied with various novel quantum phenomena, such as unconventional superconductivity, non-Fermi liquid behavior and colossal magnetoresistance. Here, based on high-pressure electrical transport and XRD measurements, and first-principles calculations, we find that a unique pressure-induced Mott transition from an antiferromagnetic Mott insulator to a ferromagnetic Weyl metal in the iron oxychalcogenide La 2 O 3 Fe 2 Se 2 occurs around 37 GPa without structural phase transition. Our theoretical calculations reveal that such an insulator-metal transition is mainly due to the enlarged bandwidth and diminishing of electron correlation at high pressure, fitting well with the experimental data. Moreover, the high-pressure ferromagnetic Weyl metallic phase possesses attractive electronic band structures with six pairs of Weyl points close to the Fermi level, and its topological property can be easily manipulated by the magnetic field. The emergence of Weyl fermions in La 2 O 3 Fe 2 Se 2 at high pressure may bridge the gap between nontrivial band topology and Mott insulating states. Our findings not only realize ferromagnetic Weyl fermions associated with the Mott transition, but also suggest pressure as an effective controlling parameter to tune the emergent phenomena in correlated electron systems.
09 May 2023
TL;DR: In this paper , the authors report interesting thermo-electric history effects associated with an electric field-induced first order phase transition from Mott-insulator to the metallic state in the epitaxial thin film of V2O3.
Abstract: We report interesting thermo-electric history effects associated with an electric field-induced first order phase transition from Mott-insulator to the metallic state in the epitaxial thin film of V2O3. This phase transition results in tuneable resistive switching in V2O3. These findings are promising for novel technologies like optoelectronics and neuromorphic computing and may lead to highly energy-efficient switching applications of Mott insulators.