Spatial control of carrier capture in two-dimensional materials: Beyond energy selection rules

TL;DR

This paper investigates how both energy and spatial dynamics influence phonon-induced carrier capture in MoSe2 monolayers, revealing a new spatial control mechanism beyond traditional energy selection rules.

Contribution

It introduces a novel spatial control mechanism for carrier capture in 2D materials, expanding beyond conventional energy-based control methods.

Findings

Spatial dynamics significantly affect carrier capture efficiency.

Carrier directionality influences capture via localized potentials.

A new control mechanism for carrier capture is demonstrated.

Abstract

Transition metal dichalcogenide monolayers have attracted wide attention due to their remarkable optical, electronic and mechanical properties. In these materials local strain distributions effectively form quasi zero-dimensional potentials, whose localized states may be populated by carrier capture from the continuum states. Using a recently developed Lindblad single-particle approach, here we study the phonon-induced carrier capture in a MoSe$_2$ monolayer. Although one decisive control parameter is the energy selection rule, which links the energy of the incoming carriers to that of the final state via the emitted phonon, we show that additionally the spatio-temporal dynamics plays a crucial role. By varying the direction of the incoming carriers with respect to the orientation of the localized potential, we introduce a new control mechanism for the carrier capture: the spatial control.