Time-induced second-order topological superconductors

Abstract

Higher-order topological materials with topologically protected states at the boundaries of their boundaries (hinges or corners) have attracted attention in recent years. In this paper, we utilize time-periodic driving to generate second-order topological superconductors out of systems which otherwise do not even allow second-order topological characterization. This is made possible by the design of the periodic drives which inherently exhibit nontrival winding in the time-domain. Through the interplay of topology in both spatial and temporal dimensions, nonchiral Majorana modes may emerge at the systems corners and sometimes even coexist with chiral Majorana modes. Our proposal thus presents a unique opportunity to Floquet engineering with minimal system complexity and its application in quantum information processing.

arXiv comment17 pages, 11 figures, new results added and discussion improved. Published version

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