Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 102: Transport: Quantum Dots, Quantum Wires, Point Contacts 2 (jointly with HL)

TT 102.3: Vortrag

Donnerstag, 19. März 2015, 15:30–15:45, A 053

Full-counting statistics of Landau-Zener interference in quantum dot arrays — •Michael Niklas1, Robert Hussein2, and Sigmund Kohler21Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 2Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain

We investigate current cumulants for the transport in coupled quantum dots driven by a time-periodic field that sweeps the system repeatedly through an avoided crossing and, thus, acts like a beam splitter. Consequently, as a function of the detuning and the driving amplitude, the cumulants exhibit Landau-Zener-Stückelberg-Majorana (LZSM) interference patterns similar to those observed for the current in driven double quantum dots [1]. These patterns indicate regions with sub- and super-Poissonian noise level. As a flexible method that allows us to study driving fields with arbitrary shape, we developed a propagation scheme for the iterative computation of current cumulants. We demonstrate that it is applicable also for larger systems such as quantum dot arrays or dimer chains.

[1] F. Forster et al., Phys. Rev. Lett. 112, 116803 (2014).

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