Instituto de Ciencia de Materiales de Madrid
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Spectral properties of stochastic resonance in quantum transport

Robert Hussein, Sigmund Kohler, Johannes C. Bayer, Timo Wagner, and Rolf J. Haug
Phys. Rev. Lett. 125, 206801 (2020)

We investigate theoretically and experimentally stochastic resonance in a quantum dot coupled to electron source and drain via time-dependent tunnel barriers. A central finding is a transition visible in the current noise spectrum as a bifurcation of a dip originally at zero frequency. The transition occurs close to the stochastic resonance working point and relates to quantized pumping. For the evaluation of power spectra from measured waiting times, we generalize a result from renewal theory to the ac driven case. Moreover, we develop a master equation method to obtain phase-averaged current noise spectra for driven quantum transport.

[ICMM-CSIC] [Condensed Matter Theory]
last modified: 15.3.2024 by Sigmund Kohler