Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 61: Quantum Dots and Wires: Transport Properties

HL 61.2: Vortrag

Mittwoch, 9. März 2016, 15:00–15:15, H16

Topological Blockade of Transport in Quantum Dot Arrays — •Mónica Benito¹, Michael Niklas², Gloria Platero¹, and Sigmund Kohler¹ — ¹Insituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain — ²Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

We discuss a transport blockade mechanism in quantum dot arrays and conducting molecules based on an interplay of Coulomb repulsion and the formation of edge states. As a model we employ a dimer chain that exhibits a topological phase transition. The connection to strongly biased electron source and drain enables transport. The topological transition is manifest in the shot noise properties as it is accompanied by a crossover from bunched electron transport to a Poisson process. We develop for both regions a scenario that can be captured by a rate equation. The resulting analytical expressions for the Fano factor agree well with the numerical solution of a full quantum master equation.

[1] M. Benito, M. Niklas, G. Platero and S. kohler, arXiv:1511.01348 (2015)