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TT: Fachverband Tiefe Temperaturen

TT 40: Topological Josephson Junctions

TT 40.8: Vortrag

Mittwoch, 18. März 2020, 16:45–17:00, HSZ 103

Quantized phase-coherent heat transport of helical Majorana modes — •Alexander G. Bauer¹, Benedikt Scharf², Ewelina M. Hankiewicz², Laurens W. Molenkamp³, and Björn Sothmann¹ — ¹Theoretische Physik, Universität Duisburg-Essen and CENIDE, D-47048 Duisburg, Germany — ²Institute of Theoretical Physics and Astrophysics and Würzburg-Dresden Cluster of Excellence ct.qmat,University of Würzburg, Am Hubland,97074 Würzburg, Germany — ³Physikalisches Institut, EP3, Universität Würzburg, Würzburg, Germany

Recently, phase-coherent heat transport in superconducting tunnel junctions has received great interest. On the one hand, it allows for the realization of caloritronic circuits [1]. On the other hand, it can serve as a probe of fundamental properties of topological quantum matter [2]. Here, we investigate heat transport in superconductor-topological insulator-superconductor (S-TI-S) hybrid junctions perpendicular to the direction of phase bias. We demonstrate that the thermal conductance is quantized for a phase difference φ=π. This arises directly from the existence of gapless Majorana modes which propagate along the S-TI interfaces. In contrast, we find a strong suppression of thermal conductance for φ ≠ π due to the opening of a gap in the Andreev bound state spectrum.

[1] F. Giazotto and M. J. Martinez-Perez, Nature 492, 401 (2012)

[2] B. Sothmann and E. M. Hankiewicz, Phys. Rev. B 94, 081407 (2016)