Initial state dependence of the quench dynamics in integrable quantum systems

Details Initial state dependence of the quench dynamics in integrable quantum systems Initial state dependence of the quench dynamics in integrable quantum systems

2011-07-28

arxiv.org/abs/1107.5811v2

Phys. Rev. A 84, 033640 (2011)

Physics

Condensed Matter

Statistical Mechanics

11 pages, 12 figures, as published

Scientific paper

10.1103/PhysRevA.84.033640

We identify and study classes of initial states in integrable quantum systems that, after the relaxation dynamics following a sudden quench, lead to near-thermal expectation values of few-body observables. In the systems considered here, those states are found to be insulating ground states of lattice hard-core boson Hamiltonians. We show that, as a suitable parameter in the initial Hamiltonian is changed, those states become closer to Fock states (products of single site states) as the outcome of the relaxation dynamics becomes closer to the thermal prediction. At the same time, the energy density approaches a Gaussian. Furthermore, the entropy associated with the generalized canonical and generalized grand-canonical ensembles, introduced to describe observables in integrable systems after relaxation, approaches that of the conventional canonical and grand-canonical ensembles. We argue that those classes of initial states are special because a control parameter allows one to tune the distribution of conserved quantities to approach the one in thermal equilibrium. This helps in understanding the approach of all the quantities studied to their thermal expectation values. However, a finite-size scaling analysis shows that this behavior should not be confused with thermalization as understood for nonintegrable systems.

Affiliated with

Also associated with

No associations

Rating

Initial state dependence of the quench dynamics in integrable quantum systems 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 Initial state dependence of the quench dynamics in integrable quantum systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initial state dependence of the quench dynamics in integrable quantum systems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-318106