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TT: Fachverband Tiefe Temperaturen

TT 12: Fluctuations and Noise

TT 12.3: Vortrag

Montag, 18. März 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