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This Week at Physics

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Events on Monday, May 12th, 2014

Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:00 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
    http://cmb.physics.wisc.edu/journal/index.html
Please feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Le Zhang (lzhang263@wisc.edu)
Host: Peter Timbie
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Condensed Matter Theory Group Seminar
Quench dynamics of the anisotropic Heisenberg model through an exact approach
Time: 4:30 pm
Place: Chamberlin 5310
Speaker: Wenshuo Liu, Rutgers University
Abstract: In this talk I will present the analytical approach we developed for the study of the quench dynamics of the anisotropic Heisenberg model (XXZ model) on the infinite line. Our approach gives the exact time-dependent wavefunctions after a quench in an integral form for any initial state and for any anisotropy ∆ by means of a generalized 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 and bound state excitations; (2) we predict the evolution of the induced spin currents. These predictions can be confronted with experiments in ultracold gases in optical lattices. We also show how the “string” solutions of Bethe Ansatz equations emerge naturally from the contour approach.
Host: Vavilov
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