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Highly tunable time-reversal-invariant topological superconductivity in topological insulator thin films
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. IPM, Inst Res Fundamental Sci, Sch Phys, Tehran 193955531, Iran..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 9817Article in journal (Refereed) Published
Abstract [en]

We study time-reversal-invariant topological superconductivity in topological insulator (TI) thin films including both intra-and inter-surface pairing. We find a nontrivial topology for multiple different configurations. For intra-surface pairing a p-phase difference between the intra-surface pairing states is required. We show that in this case the resulting topological phase is highly tunable by both an applied electric field and varied chemical potential. For spin-singlet inter-surface pairing, a sign-changing tunnel coupling present in many TI thin films is needed, and again, the topology can be tuned by electric field or doping. Notably, we find that the required inter-surface pairing strength for achieving nontrivial topology can still be subdominant compared to the intra-surface pairing. Finally, for spin-triplet intersurface pairing we prove that the superconducting state is always topological nontrivial. We show that thin films of Cu-doped Bi2Se3 will likely host such spin-triplet inter-surface pairing. Taken together, these results show that time-reversal-invariant topological superconductivity is common in superconducting TI thin films and that the topological phase and its Kramers pair of Majorana edge modes is highly tunable with an applied electric field and varied chemical potential.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 7, article id 9817
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-335228DOI: 10.1038/s41598-017-10510-yISI: 000408538100059PubMedID: 28852177OAI: oai:DiVA.org:uu-335228DiVA, id: diva2:1162843
Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2017-12-05Bibliographically approved

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