Light-cone effect and relaxation after a quantum quench from excited states in the Ising chain

5th Young Researcher Meeting, Trieste 2014

Bucciantini, Leda^1

Dipartimento di Fisica, Università di Pisa, INFN, Pisa

56127, Italy^1

关键词: Cone effects;    Entanglement entropy;    Gibbs ensemble;    Initial state;    Local observables;    Time evolutions;    Transverse field;    Two-point function;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/566/1/012026/pdf
DOI  :  10.1088/1742-6596/566/1/012026

来源: IOP

【 摘 要 】

The time evolution and stationary behaviour of local observables is studied after a quantum quench of the magnetic field in the transverse field Ising chain, when the initial state is chosen as an excited state of the pre-quench Hamiltonian. Relaxation to the Generalized Gibbs Ensemble is proved. Equal-time longitudinal two point function and entanglement entropy are analytically derived for a class of excited states which confirm the light-cone spreading of correlations also starting from excited states.