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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2002

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

Résumé

We measure the electron phase-coherence time τφ up to 18 K using universal fluctuations in the low-temperature magnetoconductance of an open InGaAs quantum dot. The temperature dependence of τφ is quantitatively consistent with the two-dimensional model of electron-electron interactions in disordered systems. In our sample, τφ 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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Dates et versions

hal-00147835 , version 1 (21-05-2007)

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Benoit Hackens, François Delfosse, Sébastien Faniel, Cédric Gustin, Hervé Boutry, et al.. Long dephasing time and high temperature conductance fluctuations in open InGaAs quantum dot. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2002, 66, pp.241305/1-4. ⟨10.1103/PhysRevB.66.241305⟩. ⟨hal-00147835⟩
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