Effect of nonadiabatic switching of dynamic perturbations in 1d Fermi systems

TL;DR

This paper investigates the effects of nonadiabatic, finite-time switching of a dynamic impurity in a 1D fermionic system, analyzing energy density and relaxation times in out-of-equilibrium conditions.

Contribution

It introduces a model for a time-dependent impurity in 1D fermionic systems and characterizes the energy response and relaxation dynamics during finite-time switching.

Findings

Identifies two regimes based on the relation between perturbation frequency and electron energy.

Derives a relaxation time scale $t_{R}$ relevant for finite-time switching.

Provides insights into nonadiabatic effects in out-of-equilibrium 1D fermionic systems.

Abstract

We study a two-dimensional fermionic QFT used to model 1D strongly correlated electrons in the presence of a time-dependent impurity that drives the system out of equilibrium. In contrast to previous investigations, we consider a dynamic barrier switched on at a finite time. We compute the total energy density (TED) of the system and establish two well defined regimes in terms of the relationship between the frequency of the time-dependent perturbation $\Omega$ and the electron energy $\omega$. Finally, we derive a relaxation time $t_{R}$ such that for times shorter than $t_{R}$ the finite-time switching process is relevant.