Charge Relaxation and Dephasing in Coulomb Coupled Conductors

Details Charge Relaxation and Dephasing in Coulomb Coupled Conductors Charge Relaxation and Dephasing in Coulomb Coupled Conductors

1999-02-24

arxiv.org/abs/cond-mat/9902320v1

Phys. Rev. B 61, 2737 (2000).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.61.2737

The dephasing time in coupled mesoscopic conductors is caused by the fluctuations of the dipolar charge permitted by the long range Coulomb interaction. We relate the phase breaking time to elementary transport coefficients which describe the dynamics of this dipole: the capacitance, an equilibrium charge relaxation resistance and in the presence of transport through one of the conductors a non-equilibrium charge relaxation resistance. The discussion is illustrated for a quantum point contact in a high magnetic field in proximity to a quantum dot.

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