scispace - formally typeset
Search or ask a question
Topic

Mott transition

About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the metal-insulator transition in the ground state of the Hubbard chain with the next-nearest-neighbor hopping is studied by exact diagonalization method.
Abstract: Metal–insulator transition in the ground state of the Hubbard chain with the next-nearest-neighbor hopping is studied by exact diagonalization method. This model shows the partially ferromagnetic metal near the Mott insulator for large Coulomb repulsion while the model reveals the non-magnetic metal for small but finite Coulomb repulsion. We find the transition between the partially ferromagnetic metal and the Mott insulator without phase separation. A new critical exponent of the diverging charge compressibility with respect to the hole density is observed when the system approaches the metal–Mott-insulator transition point from the side of the partially ferromagnetic metal. We also find the occurrence of the phase separation between partially ferromagnetic metal and the Mott insulator for even larger Coulomb repulsion. The model proposed here is interesting in view of the magnetism as well as the metal–insulator transition.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the Lancz diagonalization method was used to investigate the charge dynamics of perovskite Mn oxides by taking the orbital degeneracy of e g conduction bands and the Coulomb interaction into account in a double exchange model.
Abstract: Taking the orbital degeneracy of e g conduction bands and the Coulomb interaction into account in a double-exchange model, we investigate the charge dynamics of perovskite Mn oxides by the Lancz\(\ddot{\rm o}\)s diagonalization method. In the metallic phase near the Mott insulator, it is found that the optical conductivity for a spin-polarized two-dimensional system exhibits a weight transfer to a broad and incoherent structure within the lower-Hubbard band together with a suppressed Drude weight. It reproduces a qualitative feature of the experimental results. As an orbital effect, we find that an anomalous charge correlation at quarter filling suppresses the coherent charge dynamics and signals precursor to the charge ordering.

10 citations

Journal ArticleDOI
TL;DR: Evidence for Mott quantum criticality in an anisotropic two-dimensional system of coupled Hubbard chains at half-filling and the relevance of the findings to a putative quantum critical point in layered organic conductors, whose location remains elusive so far is discussed.
Abstract: We present evidence for Mott quantum criticality in an anisotropic two-dimensional system of coupled Hubbard chains at half-filling. In this scenario emerging from variational cluster approximation and cluster dynamical mean-field theory, the interchain hopping t_{⊥} acts as a control parameter driving the second-order critical end point T_{c} of the metal-insulator transition down to zero at t_{⊥}^{c}/t≃0.2. Below t_{⊥}^{c}, the volume of the hole and electron Fermi pockets of a compensated metal vanishes continuously at the Mott transition. Above t_{⊥}^{c}, the volume reduction of the pockets is cut off by a first-order transition. We discuss the relevance of our findings to a putative quantum critical point in layered organic conductors, whose location remains elusive so far.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the authors considered a bilayer Hubbard model on a triangular lattice and observed an enhancement of the effective mass as the first layer approaches integer filling and the second remains only partially filled.
Abstract: Inspired by recent experiments on 3He films between one and two atoms thick, we consider a bilayer Hubbard model on a triangular lattice. Our results are obtained in the framework of a cluster dynamical mean-field calculation with a quantum Monte Carlo impurity solver. For appropriate model parameters, we observe an enhancement of the effective mass as the first layer approaches integer filling and the second remains only partially filled. At finite temperatures, this increase of the effective mass -- or, equivalently, the decrease of the coherence temperature -- leads to a crossover to a state where the first layer fermions localize, drop out of the Luttinger volume, and generate essentially free local moments. This finite temperature behavior is shown to be robust against the cluster size above some critical temperature. The zero temperature phase diagram, however, depends on the cluster topology. In particular, for clusters with an even number of unit cells, the growth of the effective mass is cut off by a first-order, orbital-selective Mott transition.

10 citations


Network Information
Related Topics (5)
Superconductivity
71.9K papers, 1.3M citations
91% related
Magnetization
107.8K papers, 1.9M citations
89% related
Phase transition
82.8K papers, 1.6M citations
86% related
Ground state
70K papers, 1.5M citations
86% related
Quantum
60K papers, 1.2M citations
85% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202271
202165
202064
201968
201871