Double-Pulse Deexcitations in a One-Dimensional Strongly Correlated System

TL;DR

This study explores how two successive laser pulses can precisely control excitation and deexcitation in a one-dimensional strongly correlated electron system, revealing potential for ultrafast phase manipulation.

Contribution

It introduces a method to control ultrafast electronic transitions in a strongly correlated system using double-pulse excitation and explains the physics with a modified Rabi model.

Findings

Excitation and deexcitation can be precisely controlled by pulse timing.

The physics is explained by a modified Rabi model.

Ultrafast transition control is demonstrated in simulations.

Abstract

We investigate the ultrafast optical response of the one-dimensional half-filled extended Hubbard model exposed to two successive laser pulses. By using the time-dependent Lanczos method, we find that following the first pulse, the excitation and deexcitation process between the ground state and excitonic states can be precisely controlled by the relative temporal displacement of the pulses. The underlying physics can be understood in terms of a modified Rabi model. Our simulations clearly demonstrate the controllability of ultrafast transition between excited and deexcited phases in strongly correlated electron systems.