Photo-induced Tomonaga-Luttinger-like liquid in a Mott insulator

TL;DR

This paper demonstrates that strong photo-irradiation can induce a Tomonaga-Luttinger-like metallic state in a Mott insulator, revealing new nonequilibrium electronic properties through advanced simulations.

Contribution

It introduces a novel nonequilibrium state in a Mott insulator induced by photo-excitation, characterized by a Luttinger-liquid-like dispersion in the optical spectrum.

Findings

Photo-induced linear dispersion in optical spectrum.

Retention of des Cloizeaux-Pearson mode in spin spectrum.

Charge velocity renormalization explained by an effective Dirac model.

Abstract

Photo-induced metallic states in a Mott insulator are studied for the half-filled, one-dimensional Hubbard model with the time-dependent density matrix renormalization group. An irradiation of strong AC field is found to create a linear dispersion in the optical spectrum (current-current correlation) in the nonequilibrium steady state reminiscent of the Tomonaga-Luttinger liquid for the doped Mott insulator in equilibrium. The spin spectrum in nonequilibrium retains the des Cloizeaux-Pearson mode with the spin velocity differing from the charge velocity. The mechanism of the photocarrier-doping, along with the renormalization in the charge velocity, is analyzed in terms of an effective Dirac model.