Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot

C. Karrasch, S. Andergassen, M. Pletyukhov, D. Schuricht, L. Borda, V. Meden, H. Schoeller

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

We study the steady-state current in a minimal model for a quantum dot dominated by charge fluctuations and analytically describe the time evolution into this state. The current is driven by a finite-bias voltage V across the dot, and two different renormalization group methods are used to treat small-to-intermediate local Coulomb interactions. The corresponding flow equations can be solved analytically, which allows to identify all microscopic cutoff scales. Exploring the entire parameter space we find rich non-equilibrium physics which cannot be understood by simply considering the bias voltage as an infrared cutoff. For the experimentally relevant case of left-right asymmetric couplings, the current generically shows a power law suppression for large V. The relaxation dynamics towards the steady state features characteristic oscillations as well as an interplay of exponential and power law decay.

Original languageEnglish
Article number30003
JournalEPL
Volume90
Issue number3
DOIs
Publication statusPublished - 2010

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quantum dots
cut-off
flow equations
renormalization group methods
electric potential
retarding
oscillations
physics
decay
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Karrasch, C., Andergassen, S., Pletyukhov, M., Schuricht, D., Borda, L., Meden, V., & Schoeller, H. (2010). Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot. EPL, 90(3), [30003]. https://doi.org/10.1209/0295-5075/90/30003

Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot. / Karrasch, C.; Andergassen, S.; Pletyukhov, M.; Schuricht, D.; Borda, L.; Meden, V.; Schoeller, H.

In: EPL, Vol. 90, No. 3, 30003, 2010.

Research output: Contribution to journalArticle

Karrasch, C, Andergassen, S, Pletyukhov, M, Schuricht, D, Borda, L, Meden, V & Schoeller, H 2010, 'Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot', EPL, vol. 90, no. 3, 30003. https://doi.org/10.1209/0295-5075/90/30003
Karrasch C, Andergassen S, Pletyukhov M, Schuricht D, Borda L, Meden V et al. Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot. EPL. 2010;90(3). 30003. https://doi.org/10.1209/0295-5075/90/30003
Karrasch, C. ; Andergassen, S. ; Pletyukhov, M. ; Schuricht, D. ; Borda, L. ; Meden, V. ; Schoeller, H. / Non-equilibrium current and relaxation dynamics of a charge-fluctuating quantum dot. In: EPL. 2010 ; Vol. 90, No. 3.
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