Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Majorana Physics

TT 11.2: Vortrag

Montag, 1. April 2019, 15:15–15:30, H4

Probing Majorana bound states with an optical quantum dot — •Lena Bittermann1, Daniel Frombach1, Christophe De Beule1, and Patrik Recher1,21Institut für Mathematische Physik, TU Braunschweig — 2Laboratory for Emerging Nanometrology Braunschweig

Majorana bound states (MBSs) arise at the ends of a semiconducting nanowire in proximity to a superconductor when a sufficiently strong magnetic field is applied. Ever since signatures of MBSs were discovered, there has been a lot of research exploring their properties. Nevertheless, their spin structure [1] has only recently gotten attention. By coupling a quantum dot to one of the ends of the wire [2], the spin and non-local properties can be investigated [3].

Here, we propose a setup where we use an optical quantum dot as a spectroscopic tool. At first we solve the low-energy model for the wire coupled to the quantum dot and calculate the corresponding transition rates for creation of photons via optical recombination. Furthermore, we use a master equation formalism to obtain the steady-state occupation probabilities. By analyzing the resulting photon emission spectrum, we can draw conclusions on the spin polarization of the MBSs for different recombination processes.
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E. Prada, R. Aguado and P. San-Jose, PRB 96, 085418 (2017)

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