Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 1: Topology: Majorana Physics
TT 1.7: Talk
Monday, September 5, 2022, 11:30–11:45, H10
Photonic noise as a probe of Majorana bound states — •Lena Bittermann1, Fernando Dominguez1, and Patrik Recher1,2 — 1Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany — 2Laboratory for Emerging Nanometrology Braunschweig, D-38106 Braunschweig, Germany
We propose a route to detect Majorana bound states (MBSs) by coupling a topological superconductor to a quantum dot (QD) in a pn-junction. Here, two MBSs are coherently coupled to electrons on the QD, which recombine with holes in situ to photons. Importantly, the polarization of the emitted photons provides direct information on the spin structure [1,2] and nonlocality [2,3] of the MBSs. Here, we focus on the shot noise of the emitted photons which allows to clearly distinguish the cases of well separated MBSs at zero energy from overlapping MBSs. In addition, we show that quasiparticle poisoning changes the shot noise from super-Poissonian to sub-Poissonian. Furthermore, this setup can be extended by coupling a second QD close to the second MBS which gives rise to more resonances in the shot noise leading to additional signatures of the MBSs.
[1] D. Sticlet, C. Bena, P. Simon, PRL 108, 096802 (2012)
[2] E. Prada, R. Aguado, P. San-Jose, PRB 96, 085418 (2017)
[3] A. Schuray, L. Weithofer, P. Recher, PRB 96, 085417 (2017)