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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-3352
DTSTART:20140512T213000Z
DTEND:20140512T223000Z
DTSTAMP:20240525T212421Z
LAST-MODIFIED:20140421T204745Z
LOCATION:Chamberlin 5310
SUMMARY:Quench dynamics of the anisotropic Heisenberg model through an
exact approach\, Condensed Matter Theory Group Seminar\, Wenshuo Liu\
, Rutgers University
DESCRIPTION:In this talk I will present the analytical approach we dev
eloped for the study of the quench dynamics of the anisotropic Heisenb
erg model (XXZ model) on the infinite line. Our approach gives the exa
ct time-dependent wavefunctions after a quench in an integral form for
any initial state and for any anisotropy ∆ by means of a generalize
d Yudson contour representation. We calculate the evolution of several
observables from two particular initial states: starting from a local
N`eel state we calculate the time evolution of the antiferromagnetic
order parameter --staggered magnetization\; starting from a state with
consecutive flipped spins (1) we calculate the evolution of the local
magnetization and express it in terms of the propagation of magnons a
nd bound state excitations\; (2) we predict the evolution of the induc
ed spin currents. These predictions can be confronted with experiments
in ultracold gases in optical lattices. We also show how the “strin
g” solutions of Bethe Ansatz equations emerge naturally from the con
tour approach.
URL:https://www.physics.wisc.edu/events/?id=3352
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