Dresden 2020 – wissenschaftliches Programm
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TT 65.19: Poster
Donnerstag, 19. März 2020, 15:00–19:00, P2/EG
Probing Majorana bound states with an optical quantum dot — •Lena Bittermann1, Daniel Frombach1, Christophe De Beule1, and Patrik Recher1,2 — 1Institut für Mathematische Physik, Technische Universität Braunschweig, Braunschweig, Germany — 2Laboratory for Emerging Nanometrology, Braunschweig, Germany
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  has only recently attracted attention. By coupling a quantum dot to one of the ends of the wire , the spin and nonlocal properties can be investigated [3,4].
Here, we propose a setup where we use an optical quantum dot tunnel-coupled to the end of a Majorana nanowire and to a hole reservoir forming a pn-junction as a spectroscopic tool. First, we solve the low-energy model for the wire coupled to the quantum dot and calculate the corresponding transition rates for the 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 intensities, we can draw conclusions on the spin polarization and nonlocality of the MBSs.
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