Articoli in riviste
|Off equilibrium dynamics in disordered quantum spin chain|
|Abriet S., Karevski D.|
|European Physical Journal B 30 (2002) 77|
|ArXiv : cond-mat/0209487 [PDF]|
|HAL : hal-00008625|
We study the non-equilibrium time evolution of the average transverse magnetisation and end-to-end correlation functions of the random Ising quantum chain. Starting with fully magnetised states, either in the x or z direction, we compute numerically the average quantities. They show similar behaviour to the homogeneous chain, that is an algebraic decay in time toward a stationary state. During the time evolution, the spatial correlations, measured from one end to the other of the chain, are building up and finally at long time they reach a size-dependent constant depending on the distance from criticality. Analytical arguments are given which support the numerical results.