Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.51: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Modulation of Majorana induced current cross-correlations by quantum dots — •Björn Zocher1,2 and Bernd Rosenow1 — 1Institut für Theoretische Physik, Universität Leipzig, D-04103 Leipzig, Germany — 2Max Planck Institut für Mathematik in den Naturwissenschaften, D-04103 Leipzig, Germany
We study charge transport through a topological superconductor with a pair of Majorana end states, coupled to leads via quantum dots with resonant levels [1]. The non-locality of the Majorana bound states opens the possibility of crossed Andreev reflection with nonlocal shot noise, due to the injection of an electron into one end of the superconductor followed by the emission of a hole at the other end. In the space of energies of the two resonant quantum dot levels, we find a four peaked clover-like pattern for the strength of noise due to crossed Andreev reflection, distinct from the single ellipsoidal peak found in the absence of Majorana bound states. For finite temperatures, we observe a characteristic sign change of the crossed noise for two leafs of the clover-like pattern. We apply our findings to disordered multichannel semiconductor-superconductor heterostructures with Rashba spin-orbit coupling which are predicted to host Majorana bound states [2] and show that the clover-like crossed noise pattern is a robust feature of quasi one-dimensional Majorana wires.
[1] B. Zocher and B. Rosenow, arXiv:1208.4092
J. D. Sau, R. M. Lutchyn, S. Tewari, and S. Das Sarma, Phys. Rev. Lett. 104, 040502 (2010)