Thursday, September 10, 2009, 3:00 pm — Small Seminar Room, Bldg. 510
I discuss possible temperature versus filling factor phase diagrams of ultra-thin films or surfaces
of bulk complex oxide superconductors, which are modeled via an extended attractive Hubbard
model that allows pairing in three singlet channels: local s-wave, extended s-wave and d-wave. I
will describe the accessible phases in the temperature versus filling factor phase diagram, which
can change substantially depending on the ratio between local and near-neighbor attractions,
producing regions with pure s-wave and d-wave symmetries, as well as regions with mixed s-
wave and d-wave symmetries. Some of the possible superconducting phases spontaneously
break time reversal symmetry, and could be visited by changing temperature and/or filling factor.
Lastly, I characterize some of the accessible phases via their superfluid density tensor and
penetration depth, which might be measurable in the ultra-thin film or surface configuration.
Hosted by: Ivan Bozovic
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