Time dependence of correlation functions following a quantum quench

Journal article

We show that the time dependence of correlation functions in an extended quantum system in d dimensions, which is prepared in the ground state of some Hamiltonian and then evolves without dissipation according to some other Hamiltonian, may be extracted using methods of boundary critical phenomena in d+1 dimensions. For d=1 particularly powerful results are available using conformal field theory. These are checked against those available from solvable models. They may be explained in terms of a picture, valid more generally, whereby quasiparticles, entangled over regions of the order of the correlation length in the initial state, then propagate classically through the system. © 2006 The American Physical Society.

Authors: Calabrese, P; Cardy, J

• Journal: Physical Review Letters
• Volume: 96
• Issue: 13
• Publication date: 2006-01-01
• DOI: 10.1103/PhysRevLett.96.136801
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English