Long dephasing time and high temperature ballistic transport in an InGaAs open quantum dot
(2002) International Conference on Superlattices Nano-Structures and Nano-Devices (ICSNN-02) — Location: TOULOUSE(France) (22.June.2002)
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- 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 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 (betwe en T-1 and T-2). Below 150 K, the characteristic length associated with "focusing" fluctuations shows a slightly different temperature dependence from that of the conductivity. (C) 2002 Elsevier Science B.V. All rights reserved.
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Hackens, B., Faniel, S., Delfosse, F., Gustin, C., Boutry, H., Huynen, I., Wallart, X., Bollaert, S., Cappy, A., & Bayot, V. (2002). Long dephasing time and high temperature ballistic transport in an InGaAs open quantum dot. International Conference on Superlattices Nano-Structures and Nano-Devices (ICSNN-02), TOULOUSE(France). https://doi.org/10.1016/S1386-9477(02)00713-0