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Prof. Dr. M. Weidemüller
Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg
 
06221-5419470
Claudia Krämer
25.7.2018 17:00 / 17:30
entf?llt
, Kirchhoff-Institut, INF 227 SR 1.403

CQD special colloquium

 

17. January 2018 14:00

Seminarraum, Institut für Theoretische Physik, Philosophenweg 19

Multiply quantised vortices in fermionic superfluids: angular momentum, unpaired fermions, and spectral asymmetry

Dr. Sergej Moroz
Technische Universität München


Quantized vortices are a hallmark of superfluids and superconductors. In this seminar I will talk about the orbital angular momentum Lz of an s-wave paired superfluid in the presence of an axisymmetric multiply quantised vortex. For vortices with winding number |k| > 1, I will argue that in the weak-pairing BCS regime, Lz is significantly reduced from its value Lz=\hbar N k/2 in the BEC regime, where N is the total number of fermions. This deviation results from the presence of unpaired fermions in the BCS ground state, which arise as a consequence of spectral flow along the vortex sub-gap states.

 

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