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

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arxiv cond-mat/0210093 v1 pith:VNTKNZEH submitted 2002-10-04 cond-mat.mes-hall

B. Hackens , S. Faniel , F. Delfosse , C. Gustin , H. Boutry , I. Huynen , X. Wallaert , S. Bollaert
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A. Cappy V. Bayot
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classification cond-mat.mes-hall
keywords fluctuationsquantumtemperatureballisticdependencefocusingingaasmagnetoconductance
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We report on measurements of the magnetoconductance of an open circular InGaAs quantum dot between 1.3K and 204K. We observe two types of magnetoconductance fluctuations: universal conductance fluctuations (UCFs), and 'focusing' fluctuations 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 150K, the characteristic length associated with 'focusing' fluctuations shows a slightly different temperature dependence from that of the conductivity.

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