Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 48: Topology: Majorana Physics
TT 48.1: Invited Talk
Thursday, March 20, 2025, 15:00–15:30, H32
Optical Conductivity as a Probe for Chiral Majorana Edge Modes — •Lina Johnsen Kamra1,2,3, Bo Lu4, Jacob Linder1, Yukio Tanaka5, and Naoto Nagaosa6 — 1Norwegian University of Science and Technology, Trondheim, Norway — 2Universidad Autónoma de Madrid, Madrid, Spain — 3Massachusetts Institute of Technology, Cambridge, USA — 4Tianjin University, Tianjin, China — 5Nagoya University, Nagoya, Japan — 6RIKEN, Saitama, Japan
Recent years have seen considerable progress towards realizing nonabelian particles for topological quantum devices. A prominent example is the chiral Majorana mode at the edge of topological superconductors. It introduces the possibility of using wave packets propagating at high speed as an alternative to the braiding of zero-dimensional Majorana bound states. However, a weak spot in detecting them lies in reliably capturing quantitative measures such as a quantized conductivity. Recent advances in microwave microscopy [1] have opened a promising new avenue for observing distinct qualitative signatures in their optical conductivity [2,3]. These emerge due to the unique dispersion of the Majorana edge mode that allows photons to break up Cooper pairs into propagating Majorana fermions [2]. As a guide to future experiments, we have shown how the local optical conductivity presents distinct and tunable qualitative features that depend on the symmetry of the superconductivity [3].
[1] K. Lee et al., Sci. Adv. 6, eabd1919 (2020);
[2] J. J. He et al., Phys. Rev. Lett. 126, 237002 (2021);
[3] L. J. Kamra et al., Proc. Natl. Acad. Sci. 121, e2404009121 (2024).
Keywords: Chiral Majorana edge mode; Topological superconductors; Optical conductivity