Variational Monte Carlo Study of Electron Differentiation around Mott Transition

Abstract

We study ground-state properties of the two-dimensional Hubbard model at half filling by improving variational Monte Carlo method and by implementing quantum-number projection and multi-variable optimization. The improved variational wave function enables a highly accurate description of the Mott transition and strong fluctuations in metals. We clarify how anomalous metals appear near the first-order Mott transition. The double occupancy stays nearly constant as a function of the on-site Coulomb interaction in the metallic phase near the Mott transition in agreement with the previous unbiased results. This unconventional metal at half filling is stabilized by a formation of ``electron-like pockets'' coexisting with an arc structure, which leads to a prominent differentiation of electrons in momentum space. An abrupt collapse of the ``pocket'' and ``arc'' drives the first-order Mott transition.

4 pages, 3 figures

References in corpus (5)

• Pseudogap and Mott Transition Studied by Cellular Dynamical Mean Field Theory
• Exact diagonalization study of Mott transition in the Hubbard model on an anisotropic triangular lattice
• Universality Classes of Metal-Insulator Transitions in Strongly Correlated Electron Systems and Mechanism of High-Temperature Superconductivity
• Quantum-number projection in the path-integral renormalization group method
• Phase separation and competition of superconductivity and magnetism in the two-dimensional Hubbard model: From strong to weak coupling

Cited by in corpus (1)

• Variational Monte Carlo Method Combined with Quantum-Number Projection and Multi-Variable Optimization