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TT: Fachverband Tiefe Temperaturen
TT 55: Superconductivity: Tunneling and Josephson Junctions
TT 55.12: Talk
Thursday, April 4, 2019, 12:30–12:45, H23
Microwave spectroscopy reveals the quantum geometric tensor of topological Josephson matter — •Raffael L. Klees1, Gianluca Rastelli1, Juan Carlos Cuevas2, and Wolfgang Belzig1 — 1Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — 2Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
Concepts like Chern numbers and their relation to physical phenomena have become very familiar, but actually, key quantities like the quantum geometric tensor [1], which provides a much deeper information about quantum states, remain experimentally difficult to access.
Recently it has been shown that multiterminal superconducting junctions constitute an ideal playground to mimic topological systems in a controlled manner [2].
We study the spectrum of Andreev bound states in topological Josephson matter and demonstrate that the quantum geometric tensor of the ground state manifold can be extracted with the help of microwave spectroscopy [3].
We develop the concept of artificially polarized microwaves, which can be used to
obtain both the quantum metric tensor and the Berry curvature.
The quantized integrated absorption provides a direct evidence of topological quantum properties of the Andreev states.
M. Kolodrubetz et al., Phys. Rep. 697, 1 (2017)
R.-P. Riwar et al., Nat. Commun. 7, 11167 (2016);
J. S. Meyer and M. Houzet, Phys. Rev. Lett. 119, 136807 (2017);
H.-Y. Xie et al., Phys. Rev. B 96, 161406 (2017);
Phys. Rev.
B 97, 035443 (2018).
[3] R. L. Klees et al., arXiv:1810.11277