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SUMMARY:PSEUDO-DRAG OF A POLARITON SUPERFLUID - Professor Alexey Kavokin  
 Institute of Natural Sciences\, Westlake University\, Hangzhou\, China 
DTSTART:20190507T130000Z
DTEND:20190507T140000Z
UID:TALK124177@talks.cam.ac.uk
CONTACT:Prof Natalia Berloff
DESCRIPTION:The common wisdom tells us that the drag effect is incompatibl
 e with superfluidity. A superfluid is characterized by zero viscosity\, he
 nce it cannot be dragged. The question we would like discuss here is: does
  it apply to polariton superfluids as well? The theoretical work by Berman
 \, Kezerashvili and Lozovik offers a negative answer to this question [1].
  The authors of Ref. [1] propose the disappearance of drag as a smoking gu
 n for the superfluid transition in an exciton-polariton liquid. This concl
 usion is challenged by the recent experimental work [2]\, where the propag
 ation of a polariton superfluid in the presence of an electric current is 
 studied. I will discuss several scenarios that may lead to a (pseudo) drag
  of a superfluid by an electric current and vice versa. I will show that t
 he most likely mechanism is linked to the driven-dissipative nature of pol
 ariton superfluids that brings an interesting new physics which cannot be 
 encountered in a superfluid liquid Helium.\n\nReferences \n \n[1]. O. Berm
 an\, R.Ya. Kezerashvili and Yu.E. Lozovik\, Drag Effect in a System of Ele
 ctrons and Polaritons\, Phys. Rev. B 82\, 125307 (2010).\n[2]. D.M. Myers\
 , B. Ozden\, J. Beaumariage\, D.W. Snoke\, L.N. Pfeiffer\, and K. West\, P
 ushing Photons with Electrons: Observation of the Polariton Drag Effect\, 
 arXiv: 1808.07866v1
LOCATION:MR3
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