Universität zu Köln

Trang, C. X., Shimamura, N., Nakayama, K., Souma, S., Sugawara, K., Watanabe, I., Yamauchi, K., Oguchi, T., Segawa, K., Takahashi, T., Ando, Yoichi ORCID: 0000-0002-3553-3355 and Sato, T. (2020). Conversion of a conventional superconductor into a topological superconductor by topological proximity effect. Nat. Commun., 11 (1). LONDON: NATURE PUBLISHING GROUP. ISSN 2041-1723

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Abstract

Realization of topological superconductors (TSCs) hosting Majorana fermions is a central challenge in condensed-matter physics. One approach is to use the superconducting proximity effect (SPE) in heterostructures, where a topological insulator contacted with a superconductor hosts an effective p-wave pairing by the penetration of Cooper pairs across the interface. However, this approach suffers a difficulty in accessing the topological interface buried deep beneath the surface. Here, we propose an alternative approach to realize topological superconductivity without SPE. In a Pb(111) thin film grown on TlBiSe2, we discover that the Dirac-cone state of substrate TlBiSe2 migrates to the top surface of Pb film and obtains an energy gap below the superconducting transition temperature of Pb. This suggests that a Bardeen-Cooper-Schrieffer superconductor is converted into a TSC by the topological proximity effect. Our discovery opens a route to manipulate topological superconducting properties of materials.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Trang, C. X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shimamura, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakayama, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Souma, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sugawara, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Watanabe, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yamauchi, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Oguchi, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Segawa, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Takahashi, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Sato, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-349040
DOI:	10.1038/s41467-019-13946-0
Journal or Publication Title:	Nat. Commun.
Volume:	11
Number:	1
Date:	2020
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2041-1723
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAJORANA FERMIONS; PHOTOEMISSION; COEXISTENCE; STATE; FILMS; PB Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/34904