Physics – Quantum Physics
Scientific paper
2009-12-17
Phys. Rev. A 81, 032113 (2010)
Physics
Quantum Physics
4 pages, 2 figures
Scientific paper
A sudden change of the Hamiltonian parameter drives a quantum system out of equilibrium. For a finite-size system, expectations of observables start fluctuating in time without converging to a precise limit. A new equilibrium state emerges only in probabilistic sense, when the probability distribution for the observables expectations over long times concentrate around their mean value. In this paper we study the full statistic of generic observables after a small quench. When the quench is performed around a regular (i.e. non-critical) point of the phase diagram, generic observables are expected to be characterized by Gaussian distribution functions (``good equilibration''). Instead, when quenching around a critical point a new universal double-peaked distribution function emerges for relevant perturbations. Our analytic predictions are numerically checked for a non-integrable extension of the quantum Ising model.
Venuti Lorenzo Campos
Zanardi Paolo
No associations
LandOfFree
Universal equilibrium distribution after a small quantum quench does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Universal equilibrium distribution after a small quantum quench, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal equilibrium distribution after a small quantum quench will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-685594