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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-4800
DTSTART:20180426T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T100617Z
LAST-MODIFIED:20180402T161348Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Quantum field theory of nematic transitions in spin orbit coup
 led spin-1 polar bosons\, R. G. Herb Condensed Matter Seminar\, Elio K
 önig \, Rutgers University
DESCRIPTION:We theoretically study an ultra-cold gas of spin-1 polar b
 osons in one spatial dimension which are subject to a quadratic Zeeman
  field and a Raman induced spin-orbit coupling. Concentrating on the r
 egime in which the background fields can be treated perturbatively we 
 analytically solve the model in its low-energy sector\, i.e. we charac
 terize the relevant phases and the quantum phase transitions between t
 hem. Depending on the sign of the effective quadratic Zeeman field ε\
 , two superfluid phases with distinct nematic order appear. In additio
 n\, we uncover a spin-disordered superfluid phase at strong coupling. 
 We employ a combination of renormalization group calculations and dual
 ity transformations to access the nature of the phase transitions. At 
 ε = 0\, a line of spin-charge separated pairs of Luttinger liquids di
 vides the two nematic phases and the transition to the spin disordered
  state at strong coupling is of the Berezinskii-Kosterlitz-Thouless ty
 pe. In contrast\, at ε ≠ 0\, the quantum critical theory separating
  nematic and strong coupling spin disordered phases contains a Lutting
 er liquid in the charge sector that is coupled to a Majorana fermion i
 n the spin sector (i.e. the critical theory at finite ε maps to a qua
 ntum critical Ising model that is coupled to the charge Luttinger liqu
 id). Due to an emergent Lorentz symmetry\, both have the same\, logari
 thmically diverging velocity. We discuss the experimental signatures o
 f our findings that are relevant to ongoing experiments in ultra-cold 
 atomic gases of 23Na.
URL:https://www.physics.wisc.edu/events/?id=4800
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