Controlling quantum phases with electric fields in one-dimensional Hubbard systems
Abstract
Quantum systems under electric fields provide a powerful framework for uncovering and controlling novel quantum phases, especially in low-dimensional systems with strong correlations. In this work, we investigate quantum phase transitions induced by an electric potential difference in a one-dimensional half-filled Hubbard chain. By analyzing (i) tunneling and pairing mechanisms, (ii) charge and spin gaps, and (iii) entanglement between the chain halves, we identify three distinct phases: Mott insulator, metal and band-like insulator. The metallic regime, characterized by the closing of both charge and spin gaps, is accompanied by a field-dependent kinetic energy and a quasi-periodic oscillatory behavior of pairing response and entanglement. Although the metallic phase persists for different magnetizations, its extent in the phase diagram shrinks as spin polarization increases.
Cite
@article{arxiv.2505.15449,
title = {Controlling quantum phases with electric fields in one-dimensional Hubbard systems},
author = {D. Arisa and R. M. Dos Santos and Isaac M. Carvalho and Vivian V. França},
journal= {arXiv preprint arXiv:2505.15449},
year = {2025}
}