Superconductivity in multiband disordered systems: A vector recursion approach

Ganguly, Shreemoyee; Dasgupta, Indra; Mookerjee, Abhijit

doi:10.1103/physrevb.84.174508

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Energy Gap1

Generic Two-band Superconductor1

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“…The absence of pure interband superconductivity with zero energy states has also been established in other systems. 24,25 The absence of sub-gap states is further confirmed by numerically solving the original Hamiltonian H ab in Eq. (4).…”

Section: Energy Gapmentioning

confidence: 75%

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Odd-frequency superconducting pairing in multiband superconductors

2013

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We point out that essentially all multi-band superconductors have an odd-frequency pairing component, as follows from a general symmetry analysis of even-and odd-frequency pairing states. 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. Under these conditions odd-frequency odd-interband pairing is always present. From a symmetry analysis we establish a complete reciprocity between parity in band-index and frequency.

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Section: Energy Gapmentioning

confidence: 75%

“…With the discovery of several multi-band superconductors, intrinsic even-interband pairing has also been studied in many systems. [19][20][21][22][23][24][25] In this case the need to start with a finite band hybridization Γ in Eq. ( 4) is automatically circumvent.…”

Section: Generic Two-band Superconductormentioning

confidence: 99%