Speaker
Alexander Balatsky
Description
Odd frequency superconductivity proved to be an elusive
state that is yet to be observed as a primary pairing state.
On the other hand the list of systems and structures where
odd frequency can be present as an induced component is
growing. I will review various scenarios pointing to
emergence of odd frequency pairing due to modifications of
the primary conventional pairing. Recently we find that odd
frequency component is ubiquitously present in multiband
superconductors. We show that odd-frequency
superconducting pairing requires only a finite band
hybridization, or scattering, and non-identical intraband
order parameters, of which only one band needs to be
superconducting. From a symmetry analysis we establish a
complete reciprocity between parity in band-index and
frequency. I will also discuss extensions of the odd
frequency superconductivity to the spin and boson systems.
