Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 12: Fluctuations and Noise
TT 12.3: Talk
Monday, March 18, 2024, 15:30–15:45, H 3007
Dark states versus blocking states in electronic transport: a Lee-Yang zero analysis of full counting statistics — •Johann Zöllner1, Eric Kleinherbers2, Philipp Stegmann3, and Jürgen König1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany — 2Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA — 3Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Electronic transport through nanostructures can be suppressed by coherent population trapping, in which quantum coherence leads to a dark state that decouples from the drain electrode. Finite transport, then, relies on decoherence of the dark state [1]. An alternative scenario for reduced transport is weak coupling of a state, referred to as a blocking state, to the drain [2]. This raises the question of whether and how these two scenarios can be distinguished in the transport features. For the example of electron transport through a carbon nanotube, we identify regimes, in which this distinction is possible by analyzing the full counting statistics in terms of Lee-Yang zeros and factorial cumulants [3].
[1] A. Donarini et al., Nat. Commun. 10 (2019) 381
[2] M.-C. Harabula et al., Phys. Rev. B 97 (2018) 115403.
[3] P. Stegmann et al., Phys. Rev. B 92 (2015) 155413
Keywords: quantum dots; dark state; coherent population trapping; full counting statistics; Lee-Yang zeros