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Anomalous Floquet Chiral Topological Superconductivity in a Topological Insulator Sandwich Structure

TitleAnomalous Floquet Chiral Topological Superconductivity in a Topological Insulator Sandwich Structure
Publication TypeJournal Article
Year of Publication2021
AuthorsR-X. Zhang, and S. Das Sarma
JournalPhys. Rev. Lett.
Volume127
Date PublishedAUG 5
Type of ArticleArticle
ISSN0031-9007
Abstract

We show that Floquet chiral topological superconductivity arises naturally in Josephson junctions made of magnetic topological insulator-superconductor sandwich structures. The Josephson phase modulation associated with an applied bias voltage across the junction drives the system into the anomalous Floquet chiral topological superconductor hosting chiral Majorana edge modes in the quasienergy spectrum, with the bulk Floquet bands carrying zero Chern numbers. The bias voltage acts as a tuning parameter enabling novel Floquet topological quantum phase transitions driving the system into a myriad of exotic Majorana-carrying Floquet topological superconducting phases. Our theory establishes a new paradigm for realizing Floquet chiral topological superconductivity in solid-state systems, which should be experimentally directly accessible.

DOI10.1103/PhysRevLett.127.067001