ELFT HÍRADÓ

[Andras Palyi <andraspalyi AT caesar.elte.hu>]

Az ELTE Nanofizika Szeminarium jovo hetfoi eloadasa:


Takacs Gabor (BME): 
Correlations after quantum quenches in the XXZ spin chain: 
Failure of the Generalized Gibbs Ensemble

Idopont: 2014. december 15., hetfo, 10:15
Helyszin: ELTE Eszaki Tomb, 5.128-as terem (1117 Budapest, Pazmany Peter 
setany 1/A)

Kivonat: 
"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.”


Minden erdeklodot szivesen latunk.

Udvozlettel,
Palyi Andras