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

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

2002-10-04

arxiv.org/abs/cond-mat/0210093v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures, proceedings of ICSNN2002, to appear in Physica E

Scientific paper

10.1016/S1386-9477(02)00713-0

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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