ELFT HÍRADÓ

[tcsaba AT eik.bme.hu]

                             MEGHÍVÓ

       a BME Fizikai Intézete Elméleti Fizika Tanszékének

                         szemináriumára:


                          Gábor Takács
              BME Department of Theoretical Physics

      "Correlations after quantum quenches in the XXZ spin chain:
              Failure of the Generalized Gibbs Ensemble"

We study the nonequilibrium time evolution of the spin-1/2 anisotropic  
Heisenberg (XXZ) spin chain, with a choice of dimer product and Neel  
states as initial states. We investigate numerically various  
short-ranged spin correlators in the long-time limit and find that  
they deviate significantly from predictions based on the generalized  
Gibbs ensemble (GGE) hypotheses. By computing the asymptotic spin  
correlators within the recently proposed quench-action formalism  
[Phys. Rev. Lett. 110, 257203 (2013)], however, we find excellent  
agreement with the numerical data. We, therefore, conclude that the  
GGE cannot give a complete description even of local observables,  
while the quench-action formalism correctly captures the steady state  
in this case.


Helye: BME Fizikai Intézet, Elméleti Fizika Tanszék
Budafoki út 8. F-épület, III lépcsöház
Szemináriumi szoba

Ideje: 2014. október 31. péntek, 10:15.


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