Symmetry and Topology in Superconductors –Odd-Frequency Pairing and Edge States–
Symmetry and Topology in Superconductors –Odd-Frequency Pairing and Edge States–
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DOI：
10.1143/jpsj.81.011013
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发表时间：
2011-05
影响因子：
1.7
通讯作者：
Yukio Tanaka;M. Sato;N. Nagaosa
中科院分区：
文献类型：
--
作者：
Yukio Tanaka;M. Sato;N. Nagaosa
Superconductivity is a phenomenon where the macroscopic quantum coherence appears due to the pairing of electrons. This offers a fascinating arena to study the physics of symmetry breaking, i.e., broken gauge symmetry. However, the important symmetries in superconductors are not only the gauge invariance. Especially, the symmetry properties of the pairing, i.e., the parity and spin-singlet/spin-triplet, determine the physical properties of the superconducting state. Recently it has been recognized that there is the important third symmetry of the pair amplitude, i.e., even or odd parity with respect to the frequency. The conventional uniform superconducting states correspond to the even-frequency pairing, but the recent finding is that the odd-frequency pair amplitude arises in the spatially non-uniform situation quite ubiquitously. Especially, this is the case in the Andreev bound state (ABS) appearing at the surface/interface of the sample. The other important recent development is on the nontrivial top...
