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SUMMARY:Quantum simulations for dipolar spin systems in optical lattices
DTSTART;VALUE=DATE-TIME:20190710T133500Z
DTEND;VALUE=DATE-TIME:20190710T134800Z
DTSTAMP;VALUE=DATE-TIME:20200929T212500Z
UID:indico-contribution-72406@indico.in2p3.fr
DESCRIPTION:Speakers: laurent vernac (laboratoire de physique des lasers)\
nWe study spin systems made of large number of spin 3 chromium atoms loade
d in 3D optical lattices. We both study out-of-equilibrium spin dynamics f
rom a high energy initial state\, and how to reach the ground state of a t
extbook spin Hamiltonian. Experimental results are compared with different
approximated quantum models.\n\nOut-of-equilibrium spin dynamics follows
a collective rotation of an initially polarized ensemble\, with respect to
the external magnetic field.\nIn deep optical lattices\, with unit fillin
g\, the pure dipolar spin dynamics is benchmarked by comparison with an im
proved numerical quantum phase-space method. Although isolated from enviro
nment\, the many body state reaches an equilibrium at long dynamics time\,
which is described by a thermal distribution. Our system provides an exam
ple of quantum thermalization\, where evolution towards a thermal-like sta
te is tied to the growth of entanglement entropy [1]. \nWhen varying the l
attice depth\, we explore regimes where spin dynamics is also due to tunne
ling and super exchange processes. We compare our results with approximate
d models\, i.e. the Gutzwiller approach.\n\nWe also present preliminary re
sults about the experimental realization of an XXZ transverse spin Hamilto
nian. By ramping the transverse field\, we are able to produce non trivial
spin states\, and investigate a phase diagram which can be compared to bo
th mean field and quantum simulations. \n\n[1] Lepoutre et al\, accepted
at Nature Communication\n\nhttps://indico.in2p3.fr/event/16792/contributio
ns/72406/
LOCATION:Cité des Congrès Salle I
URL:https://indico.in2p3.fr/event/16792/contributions/72406/
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