SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Topology: Majorana Physics
TT 31.1: Vortrag
Mittwoch, 29. März 2023, 09:30–09:45, HSZ 304
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 [4]. Furthermore, this setup
can be extended by coupling a second QD close to the second MBS which gives rise to
nonlocal shot noise correlations leading to additional signatures of MBSs.
[1] D. Sticlet, C. Bena, and P. Simon, PRL 108, 096802 (2012)
[2] E. Prada, R. Aguado, and P. San-Jose, PRB 96, 085418 (2017)
[3] A. Schuray, L. Weithofer, and P. Recher, PRB 96, 085417 (2017)
[4] L. Bittermann, C. De Beule, D. Frombach, and P. Recher, PRB 106, 075305 (2022)