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TT: Fachverband Tiefe Temperaturen

TT 76: Poster Session: Transport 2

TT 76.25: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG1

Low-temperature heat transport of the topological superconductor Cu_xBi₂Se₃ — •Lionel Andersen, Zhiwei Wang, Thomas Lorenz, and Yoichi Ando — II. Physikalisches Institut - Universität zu Köln, Germany

The topological insulator Bi₂Se₃ becomes superconducting when intercalated with copper. Recently the interest in this material was heightened by the confirmation of the topological superconductivity through observations of a rotational symmetry braking [1,2].

A manifestation of Majorana fermions is predicted to be a ballistic surface heat transport [3]. This could provide a possibility of a direct macroscopic observation of these exotic surface states by standard heat transport measurements. For these measurements, a disentanglement of the contributions from phonons, surface Majorana fermions and bulk quasiparticles is required. In this poster, measurements of the heat transport of Cu_xBi₂Se₃ performed in a dilution refrigerator will be presented.

[1] K. Matano et al., Nat. Phys. 12, 852 (2016)

[2] S. Yonezawa et al., Nat. Phys. DOI: 10.1038/NPHYS3907 (2016)

[3] L. Kouvenhoven and C. Beenakker, Nat. Phys. 12, 618 (2016)