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• W2889760718 abstract "Odd-frequency Cooper pairs with chiral symmetry emerging at the edges of topological superconductors are a useful physical quantity for characterizing the topological properties of these materials. In this work, we show that the odd-frequency Cooper pair amplitudes can be expressed by a winding number extended to a nonzero frequency, which is called a ``spectral bulk-boundary correspondence,'' and can be evaluated from the spectral features of the bulk. The odd-frequency Cooper pair amplitudes are classified into two categories: the amplitudes in the first category have the singular functional form $ensuremath{sim}1/z$ (where $z$ is a complex frequency) that reflects the presence of a topological surface Andreev bound state, whereas the amplitudes in the second category have the regular form $ensuremath{sim}z$ and are regarded as nontopological. We discuss the topological phase transition by using the coefficient in the latter category, which undergoes a power-law divergence at the topological phase transition point and is used to indicate the distance to the critical point. These concepts are established based on several concrete models, including a Rashba nanowire system that is promising for realizing Majorana fermions." @default.
• W2889760718 created "2018-09-27" @default.
• W2889760718 creator A5038918929 @default.
• W2889760718 creator A5057713971 @default.
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• W2889760718 date "2019-05-22" @default.
• W2889760718 modified "2023-10-02" @default.
• W2889760718 title "Odd-frequency pairs in chiral symmetric systems: Spectral bulk-boundary correspondence and topological criticality" @default.
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• W2889760718 doi "https://doi.org/10.1103/physrevb.99.184512" @default.
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