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SUMMARY:Orbital Angular Momentum and Spectral Flow in Two Dimensional Chir
 al Superfluids - Masaki Oshikawa\, ISSP Tokyo
DTSTART:20160202T130000Z
DTEND:20160202T140000Z
UID:TALK64267@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:The orbital angular momentum in a chiral superfluid has posed 
 a paradox\nfor several decades. For example\, for the $p+ip$-wave superflu
 id of $N$\nfermions\, the total orbital angular momentum should be $N/2$ i
 f\nall the fermions form Cooper pairs. On the other hand\, it appears to\n
 be substantially suppressed from $N/2$\, considering that only the fermion
 s\nnear the Fermi surface would be affected by the pairing interaction.\nT
 o resolve the long-standing question\, we studied chiral superfluids\nin a
  two-dimensional circular well\, in terms of a conserved charge and\nspect
 ral flows.\nWe find that the total orbital angular momentum takes the full
  value $N/2$\nin the chiral $p+ip$-wave superfluid\, while it is strongly 
 suppressed\nin higher-order ($d+id$ etc.) chiral superfluids. This surpris
 ing difference\nis elucidated in terms of edge states.\n\nRef: Y. Tada\, W
 . Nie\, and M. O.\, Phys. Rev. Lett. 114\, 195301 (2015).\n\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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