Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 36: Fluctuations, Noise and Quantum Coherence

TT 36.3: Vortrag

Mittwoch, 3. April 2019, 10:00–10:15, H7

Revealing attractive electron-electron interaction in a quantum dot by full counting statistics — •Eric Kleinherbers, Philipp Stegmann, and Jürgen König — Theoretische Physik, Universität Duisburg-Essen and CENIDE, Lotharstr. 1, 47048 Duisburg

Recent experiments [1,2] have presented evidence for electron pairing in a quantum dot beyond the superconducting regime. An electron-electron attraction can effectively arise due to the surrounding solid state environment (e.g. coupling to bosonic modes as polarons, excitons or plasmons) and can be phenomenologically described by the negative-U Anderson model.

In my talk, I will discuss that an attractive interaction, compared to a repulsive one, does generate pronounced correlations in sequential electron transport [3]. In particular, these correlations are revealed by a sign change of higher-order current correlators (generalized factorial cumulants) which can be obtained from the full counting statistics of electron transfer. Remarkably, those correlations are robust against a fast spin relaxation and, most importantly, are detectable even when typical experimental limitations of a charge detector are considered.
G. Cheng et al., Nature 521, 196 (2015)
G. Prawiroatmodjo et al., Nat. Commun. 8, 395 (2017)
E. Kleinherbers, P. Stegmann, and J. König, New J. Phys. 20, 073023 (2018)