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SUMMARY:Superfluidity and superconductivity: their defeat\, fluctuation\, 
 and respect to U(1) symmetry - Prof. Wei Ku (Shanghai Jiao Tong University
 )
DTSTART:20241018T123000Z
DTEND:20241018T135000Z
UID:TALK221422@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Superfluidity and superconductivity are among the most exotic 
 phenomena of certain quantum states of matter.  Their physical understandi
 ng\, however\, are primarily based on mean-field approximations that gener
 ate Bogoliubov-type number fluctuation\, in direct contradiction to the st
 rict number conservation of the system.  Based on rigorous analytical stud
 ies of quantum many-body systems\, this talk will cover three fundamental 
 issues against standard lore: 1) how to completely suppress quantum cohere
 nce in a homogeneous system to defeat superfluidity and produce the long-s
 ought “quantum Bose metal”\, 2) why the low-temperature fluctuation of
  modern superconductors irreparably invalidates standard theories and insp
 ires qualitative correction to the standard theory of bosonic superfluidit
 y\, and 3) why superfluidity and superconductivity should not be regarded 
 with spontaneously broken U(1) symmetry and why the zero modes in the vort
 ex cores cannot be Majorana particles capable of braiding quantum informat
 ion.
LOCATION:TCM Seminar Room
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