Long dephasing time and high-temperature conductance fluctuations in an open InGaAs quantum dot

Hackens, Benoît;Delfosse, F;Faniel, Sébastien;Gustin, C.;Bayot, Vincent;et.al.
(2002) Physical review. B, Condensed matter and materials physics — Vol. 66, n° 24 (2002)

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We measure the electron phase-coherence time tau(phi) up to 18 K using universal fluctuations in the low-temperature magnetoconductance of an open InGaAs quantum dot. The temperature dependence of tau(phi) is quantitatively consistent with the two-dimensional model of electron-electron interactions in disordered systems. In our sample, tau(phi) is two to four times larger than previously reported in GaAs quantum dots. We attribute this enhancement to a larger value of the Fermi energy and the lower electron effective mass in our sample. We also observe a distinct type of conductance fluctuation due to ballistic electron focusing inside the dot up to 204 K.
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Hackens, B., Delfosse, F., Faniel, S., Gustin, C., Boutry, H., Wallart, X., Bollaert, S., Cappy, A., & Bayot, V. (2002). Long dephasing time and high-temperature conductance fluctuations in an open InGaAs quantum dot. Physical review. B, Condensed matter and materials physics, 66(24). https://doi.org/10.1103/PhysRevB.66.241305 (Original work published 2002)