Berlin 2015 – wissenschaftliches Programm
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 Kohler2 — 1Institute 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 . 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.
 F. Forster et al., Phys. Rev. Lett. 112, 116803 (2014).