AQP -seminaari: Odd-frequency spin-triplet instability in disordered electron liquid

Aalto Quantum Physics -seminaari (Nanotalo). Puhuja: Dr. Vladimir Zyuzin (Nordita, Stockholm)
AQP seminar profile

Aalto Quantum Physics -seminaari (Nanotalo). Puhuja: Dr. Vladimir Zyuzin (Nordita, Stockholm)

We studied the possibility of the odd frequency pairing, proposed by Berezinskii, in disordered conductors. In the first example, we considered the case of a very disordered system near an insulating state. There an interplay of the Coulomb interaction with strong disorder could be the source of the Cooper pairing in the triplet channel, which in turn may lead to the odd-frequency pairing. In the other considered case such an instability may develop in the vicinity of the transition into superconducting state. We discussed the existing experimental data in view of the considered exotic pairing. A hypothesis has been put forward that the odd frequency pairing, unlike the even frequency pairing, leads to an insulating behavior. Such an insulating state can be considered as an independent phase occurring before regular superconducting transition.

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