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.

中文翻译：

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拓扑绝缘体三明治结构中的异常 Floquet 手性拓扑超导性

我们表明 Floquet 手性拓扑超导性在由磁性拓扑绝缘体-超导体夹层结构制成的约瑟夫森结中自然产生。约瑟夫森相位调制与跨结施加的偏置电压相关联，将系统驱动到异常 Floquet 手性拓扑超导体中，该超导体在准能谱中具有手性 Majorana 边缘模式，体 Floquet 带携带零陈数。偏置电压作为一个调谐参数，使新的 Floquet 拓扑量子相变能够将系统驱动到无数奇异的带有马约拉纳的 Floquet 拓扑超导相。我们的理论为在固态系统中实现 Floquet 手性拓扑超导性建立了一个新范式，应该可以通过实验直接获得。