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Long dephasing time and high temperature ballistic transport in an InGaAs open quantum dot

✍ Scribed by B Hackens; S Faniel; F Delfosse; C Gustin; H Boutry; I Huynen; X Wallart; S Bollaert; A Cappy; V Bayot

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 116 KB
Volume: 17
Category: Article
ISSN: 1386-9477
DOI: 10.1016/s1386-9477(02)00713-0

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✦ Synopsis

We report on measurements of the magnetoconductance of an open circular InGaAs quantum dot between 1.3 and 204 K. We observe two types of magnetoconductance uctuations: universal conductance uctuations (UCFs), and "focusing" uctuations related to ballistic trajectories between openings. The electron phase coherence time extracted from UCFs amplitude is larger than in GaAs/AlGaAs quantum dots and follows a similar temperature dependence (between T -1 and T -2 ). Below 150 K, the characteristic length associated with "focusing" uctuations shows a slightly di erent temperature dependence from that of the conductivity.

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