Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

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 Recher1,21Institut 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 [1] has only recently attracted attention. By coupling a quantum dot to one of the ends of the wire [2], 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.

[1] D. Sticlet, C. Bena and P. Simon, PRL 108, 096802 (2012)

[2] M. T. Deng et al., Science 354, 1557 (2016)

[3] A. Schuray, L. Weithofer and P. Recher, PRB 96, 085417 (2017)

[4] E. Prada, R. Aguado and P. San-Jose, PRB 96, 085418 (2017)

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