Quantum Interference Control of Localized Carrier Distributions in the Brillouin Zone

TL;DR

This paper demonstrates how quantum interference in multi-photon absorption processes can precisely control the localization of carrier distributions in the Brillouin zone of transition-metal dichalcogenides, enabling new studies of non-equilibrium states.

Contribution

It introduces a method to manipulate carrier localization in momentum space using quantum interference effects in multi-photon absorption, differing from previous single- and two-photon studies.

Findings

Multi-photon absorption leads to highly localized carrier distributions.

Quantum interference effects depend on excitation energy.

Distinct features emerge compared to one- and two-photon processes.

Abstract

Using transition-metal dichalcogenides as an example, we show that the quantum interference arising in two- and three-photon absorption processes can lead to controllable, highly localized carrier distributions in the Brillouin zone. We contrast this with the previously studied one- and two-photon absorption, and find qualitatively different features, including changes in the relevance of interband and intraband processes according to the excitation energy. Thus, the distribution of excitations arising under certain circumstances in two- and three-photon absorption can facilitate the study of far-from-equilibrium states that are initially well localized in crystal momentum space.