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.
Cite
@article{arxiv.0807.1303,
title = {Variational Monte Carlo Study of Electron Differentiation around Mott Transition},
author = {Daisuke Tahara and Masatoshi Imada},
journal= {arXiv preprint arXiv:0807.1303},
year = {2008}
}
Comments
4 pages, 3 figures