Photoinduced spin-order destructions in one-dimensional extended Hubbard model

TL;DR

This study uses the time-dependent Lanczos method to explore how transient laser pulses can disrupt or enhance spin and charge orders in a one-dimensional extended Hubbard model, revealing potential optical control of quantum phases.

Contribution

It demonstrates the nonequilibrium dynamics of spin and charge orders under laser irradiation in the extended Hubbard model, highlighting phase boundary effects and local order enhancements.

Findings

Photoinduced charge carriers impair antiferromagnetic spin correlations in SDW phase.

Proper laser parameters can locally enhance charge or spin order near phase boundaries.

Optical methods may restore spin order from the CDW phase.

Abstract

By employing the time-dependent Lanczos method, the nonequilibrium process of the half-filled one-dimensional extended Hubbard model under the irradiation of a transient laser pulse is investigated. We show that in the spin-density-wave (SDW) phase, the antiferromagnetic spin correlations are impaired by the photoinduced charge carriers. Near the phase boundary between the SDW and charge-density-wave (CDW) phases, a local enhancement of charge (spin) order that is absent in the original SDW (CDW) phase can be realized with proper laser frequency and strength. The possibility of restoration of spin orders from the CDW phase by optical means is discussed.