Low-Temperature Saturation of the Dephasing Time and Effects of Microwave Radiation on Open Quantum Dots

Details Low-Temperature Saturation of the Dephasing Time and Effects of Microwave Radiation on Open Quantum Dots Low-Temperature Saturation of the Dephasing Time and Effects of Microwave Radiation on Open Quantum Dots

1999-04-20

arxiv.org/abs/cond-mat/9904274v1

Phys. Rev. Lett 83, 5090 (1999)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers available at http://www.stanford.edu/group/MarcusLab/

Scientific paper

10.1103/PhysRevLett.83.5090

The dephasing time of electrons in open semiconductor quantum dots, measured using ballistic weak localization, is found to saturate below ~ 100 mK, roughly twice the electron base temperature, independent of dot size. Microwave radiation deliberately coupled to the dots affects quantum interference indistinguishably from elevated temperature, suggesting that direct dephasing due to radiation is not the cause of the observed saturation. Coulomb blockade measurements show that the applied microwaves create sufficient source drain voltages to account for dephasing due to Joule heating.

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