Ultrafast transient interference in pump-probe spectroscopy of band and Mott insulators

TL;DR

This paper introduces the concept of transient interference in ultrafast pump-probe spectroscopy of band and Mott insulators, revealing how spectral information is stored and interfered within the excitation spectrum.

Contribution

It proposes the mechanism of transient interference in pump-probe spectroscopy and demonstrates it in models including electron correlations and bosonic contributions.

Findings

Transient interference observed in band insulators.

Interference persists with electron correlations in Hubbard model.

Bosons additively contribute to the interference.

Abstract

Ultrafast pump-probe spectroscopy with high temporal and spectral resolutions provides new insight into ultrafast nonequilibrium phenomena. We propose that transient interference between pump and probe pulses is realized in pump-probe spectroscopy of band and Mott insulators, which can be observed only after recent developments of ultrafast spectroscopic techniques. A continuum structure in the excitation spectrum of band insulators is found to act as a medium for storing the spectral information of the pump pulse, and the spectrum detected by the probe pulse is interfered with by the medium, generating the transient interference in the energy domain. We also demonstrate the transient interference in the presence of electron correlations in a one-dimensional half-filled Hubbard model. Furthermore, bosons coupled to electrons additively contribute to the interference. Our finding will provide an interpretation of probe-energy-dependent oscillations recently observed in the pump-probe spectrum for a two-dimensional Mott insulator.