Dynamics of Long-Living Excitons in Tunable Potential Landscapes
Andreas Gartner, Dieter Schuh, Jorg P. Kotthaus
TL;DR
This paper introduces a new experimental approach to study long-living exciton dynamics in tunable potential landscapes using lithographically defined gates, revealing long-range exciton drift in engineered quantum well structures.
Contribution
It presents a novel method for creating and controlling artificial potential landscapes for excitons, enabling detailed studies of their dynamics in semiconductor heterostructures.
Findings
Long-range exciton drift over 150 micrometers observed.
Exciton drift velocity exceeds 1000 meters per second.
Artificial potential landscapes can be precisely engineered using lithography.
Abstract
A novel method to experimentally study the dynamics of long-living excitons in coupled quantum well semiconductor heterostructures is presented. Lithographically defined top gate electrodes imprint in-plane artificial potential landscapes for excitons via the quantum confined Stark effect. Excitons are shuttled laterally in a time-dependent potential landscape defined by an interdigitated gate structure. Long-range drift exceeding a distance of 150 um at an exciton drift velocity > 1000 m/s is observed in a gradient potential formed by a resistive gate stripe.
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