







This Week at Physics 

<< Spring 2015  Fall 2015  Spring 2016 >> 
Subscribe to receive email announcements of events 
Event Number 3352
Monday, May 12th, 2014
 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 timedependent 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
 Add this event to your calendar