Strong-Coupling Superconductivity with Mixed Even- and Odd-Frequency Pairing
arXiv:1205.5746 · doi:10.1103/PhysRevB.85.174528
Abstract
We investigate general structure of Landau free energy for stabilizing a novel superconducting state with both even-frequency and odd-frequency components in gap function. On the basis of the Luttinger-Ward functional, we elucidate an emergent mixing between different "parities" in time. The simplest case of the conventional s-wave singlet mixed with the odd-frequency triplet state under broken time-reversal symmetry is examined to demonstrate the anomalous structure of the free-energy functional. The induced odd-frequency component alters behaviors of physical quantities from those obtained by neglecting the odd-frequency component. The novel mixed state may also be relevant to strong-coupling superconductivity coexisting with ferromagnetism.
11 pages, 7 figures
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- Emergent Odd-Frequency Superconducting Order Parameter near Boundaries in Unconventional Superconductors
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- Generation of odd-frequency surface superconductivity with spontaneous spin current due to the zero-energy Andreev bound state
- Odd frequency pairing in a quantum critical metal
- Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
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- Pairing properties of an odd-frequency superfluid Fermi gas
- Odd-frequency pairing of Bogoliubov quasiparticles in superconductor junction
- Odd-frequency superfluidity from a particle-number-conserving perspective