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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-383@lptms.universite-paris-saclay.fr
DTSTART:20151103T113000Z
DTEND:20151103T123000Z
DTSTAMP:20151027T085821Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-marie-piraud/
SUMMARY:Séminaire du LPTMS: Marie Piraud (ATTENTION horaire inhabituel) - 
 LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay - 3 Nov 15 11
 :30
DESCRIPTION:\nInteracting bosons on ladder in the presence of gauge fields:
  Swimming against the tide !\n\nMarie Piraud\, Ludwig-Maximilians-Universi
 tät München\n\nWe present the phase diagrams of the interacting Bose-Hub
 bard model defined on two- and three-leg ladder geometries in the presence
  of a homogeneous flux. Our work is motivated by recent experiments using 
 laser assisted-tunneling in optical lattices [1] and lattices in synthetic
  dimensions [2]\, which studied the regime of weak interactions. Based on 
 extensive density matrix renormalization group simulations and a bosonizat
 ion analysis for the two-leg ladder\, we explore the parameter space and c
 alculate experimentally accessible observables.\n\nThe phase diagrams comp
 rise gapless and gapped Meissner and vortex phases\, with the gapped state
 s emerging in Mott-insulating regimes [3\,4]. We show that vortex lattices
  also form at certain commensurate vortex densities [4\,5]. On the two-leg
  ladder\, we also find the so-called 'biased leg phase'\, which shows dens
 ity-imbalance between the two legs [6].\n\nVery interestingly\, an enlarge
 d unit cell forms in the vortex lattice phases\, which can lead to the rev
 ersal of the current circulation-direction. We demonstrate this effect for
  arbitrarily weak interactions and at sufficiently low temperature\, and s
 how that it is significant for intermediate interactions [5].\n\n[1] Atala
  etal.\, Nature Phys. 10\, 588 (2014)\n[2] Mancini etal.\, Science 349\, 1
 510-1513 (2015)\n[3] Piraud etal.\, PRB 91\, 140406(R) (2015)\n[4] Kolley 
 etal.\, NJP 17\, 092001 (2015)\n[5] Greschner etal.\, to appear in PRL (20
 15)\n[6] Wei and Mueller\, PRA 89\, 063617 (2014)\n\n
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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