Seminars & Lectures
| * TITLE | When S met F: Search for a new state of superconductivity | ||||||
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| * DATE / TIME | 2006-09-12, 4:00 p.m. | ||||||
| * PLACE | Seminar room #512, APCTP Headquarters | ||||||
| * ABSTRACT | |||||||
| Superconductivity is due to pairing and can be characterized in terms of the paired state. The antisymmetricity of the Cooper pair wave-function requires that the total spin S=0 (singlet) state have an even angular momentum , and S=1 (triplet) state an odd . If the pairing is generalized to include the different time pairing, the triplet state can be even frequency odd triplet, or odd frequency even triplet states. Recently it was realized that the odd frequency s-wave triplet state may be induced in superconductor-ferromagnet (S-F) layers. The odd frequency triplet state, however, has not been directly observed yet although there have been some hints pointing to its existence. We propose that the tunneling experiments on F/S/F trilayers should produce a clear evidence of the triplet state when the magnetization directions of the two F’s are properly controlled. I will first give qualitative arguments and then back them up with detailed calculations using the diffusive Usadel equation. | |||||||
