Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Topology: Majorana Physics
TT 15.2: Vortrag
Montag, 9. März 2026, 15:15–15:30, HSZ/0105
Distinguishing Majorana bound states from accidental zero-energy modes with a microwave cavity — Sarath Prem1, •Olesia Dmytruk2, and Mircea Trif1 — 1International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland — 2CPHT, CNRS, Ecole polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
Detecting Majorana bound states (MBSs) in hybrid nanowires is challenging as their transport measurement signatures can be mimicked by trivial zero-energy Andreev bound states (ABSs) or zero-energy quasi-Majorana bound states (QMBSs). We propose an alternative approach that relies on microwave absorption visibility that is extracted from parity-dependent cavity-nanowire susceptibility measurements. We study a one-dimensional Rashba spin-orbit nanowire with an s-wave superconductor-covered proximitized region and an uncovered quantum dot region subjected to a magnetic field with spatially varying capacitive coupling to a single-mode cavity. True MBSs yield a visibility extremum only when both Majorana modes at superconducting edges simultaneously couple to the cavity exhibiting their nonlocal characteristics. In contrast, the zero-energy ABSs or QMBSs show a visibility extremum even when the cavity couples only locally to part of the nanowire. Owing to the recent experiments on poor man’s Majoranas, we show that the visibility retains the nonlocal detection features.
[1] S. Prem, O. Dmytruk, and M. Trif, arXiv:2509.13194
Keywords: Majorana bound states; Andreev bound states; Rashba nanowire; microwave spectroscopy; poor man's Majorana bound states