| Long dephasing time and high temperature ballistic transport in an InGaAs open quantum dot (2002) | |||||||||
Abstract | |||||||||
| 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.. Comment: 6 pages, 4 figures, proceedings of ICSNN2002, to appear in Physica E | |||||||||
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