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Dynamics of LongLiving Excitons in Tunable Potential Landscapes.pdf

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Dynamics of LongLiving Excitons in Tunable Potential Landscapes

Dynamics of Long-Living Excitons in Tunable Potential Landscapes Andreas G¨artner,1, ∗ Dieter Schuh,2 and J¨org P. Kotthaus1 1 Center for Nanoscience and Department f¨ur Physik, Ludwig-Maximilians-Universit¨at, Geschwister-Scholl-Platz 1, 80539 M¨unchen, Germany 2Institut f¨ur Angewandte und Experimentelle Physik, Universit¨at Regensburg, 93040 Regensburg, Germany 5 0 A novel method to experimentally study the dynamics of long-living excitons in coupled quan- 0 tum well semiconductor heterostructures is presented. Lithographically defined top gate electrodes 2 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 interdigi- p tated gate structure. Long-range drift exceeding a distance of 150 µm at an exciton drift velocity e vd 103 m/s is observed in a gradient potential formed by a resistive gate stripe. S 6 PACS numbers: 71.35.Lk, 71.35.Gg, 78.55.Cr ] r e Introduction h t o In the past few years new material systems such as t. coupled quantum well (QW) heterostructures emerged. a They allow to host long-living excitons with life times up m to about ≈ 30 µs [1]. Being composite bosonic particles - made of an electron and a hole, excitons are expected to d show Bose-Einstein-Condensation (BEC) at low temper- n o atures and at sufficient high densities [2]. Up to pres

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