Electric field induced suppression of universal conductance fluctuations and dephasing in disordered systems

Details Electric field induced suppression of universal conductance fluctuations and dephasing in disordered systems Electric field induced suppression of universal conductance fluctuations and dephasing in disordered systems

1999-11-29

arxiv.org/abs/cond-mat/9911464v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 eps figures

Scientific paper

We report a novel phenomenon that the universal conductance fluctuations (UCF) can be suppressed by a small electric field E. The experiment has been carried out on single crystals of Si doped heavily with P and B beyond the critical composition of insulator to metal transition. The phenomenon is identified as a consequence of electric field induced dephasing of the electron wavefunction. Over the range of measurements, the observed dephasing rate (\tau_\phi^{-1}) varied as \tau_\phi^{-1} = aT + bE^q with q \approx 1.3 and for E >> E^*, a cross-over field, \tau_\phi^{-1} \sim E^q, independent of T. This experiment also establishes that the UCF can be utilized as a sensitive electron "interferometer" to measure dephasing rate.

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