Can bosonic and fermionic condensates explain superfluid and superconducting properties? Are they better than the theory of BCS and Landau?


My question is based in this lecture pesentation From BEC to CBS. In particular in this slide:

  • 2
    $\begingroup$ "Bosonic and fermionic condensates" is not a theory. Until you actually have a theory, your question isn't really answerable. What's more, BCS theory already involves fermionic condensates. $\endgroup$ – Chris Oct 16 '17 at 19:29
  • $\begingroup$ @Chris please, check out my edit. $\endgroup$ – Dinesh Shankar Oct 16 '17 at 19:50
  • $\begingroup$ I still don't understand your question. What two things are you trying to compare? BCS and Landaus theory of super-fluidity are how you describe weak coupling condensates. " bosonic and fermionic condensates" are things with superfluid or superconducting properties (zero viscosity, quantized vortices...) not theories themselves. $\endgroup$ – Shane P Kelly Oct 17 '17 at 0:25
  • $\begingroup$ Did you at least check on Wikipedia the following keywords : Bose-Einstein condensate, Fermi-Dirac degenerate gas, Landau theory of the Fermi liquid, BCS theory of superconductivity, superfluidity ? Your question make no sense at all once you read understand these concepts. If you have difficulties understanding one of these concepts, please ask specific question. $\endgroup$ – FraSchelle Oct 17 '17 at 7:34
  • $\begingroup$ Superfluidity in He^4 is more or less a Bose-Einstein condensate, in He^3 it comes from Cooper pairing of fermions to form a quasi Bose-Einstein condensate. The second order phase transition is responsible for the phenomenology of the superfluid state. A superconductor is a pseudo Bose-Einstein condensate made on top of the Cooper instability in the Fermi gas (also called a metal, this later being described by the Landau theory of the Fermi liquid). The superconducting phenomenology is explained by a Anderson-Higgs phenomenon (the electromagnetic gauge redundancy goes to a smaller group). $\endgroup$ – FraSchelle Oct 17 '17 at 7:38

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.