Guo, H. L.; Liu, Z.; Fan, H.; Chen, S. - In: The European Physical Journal B - Condensed Matter and … 79 (2011) 4, pp. 503-507
Starting from a general Hamiltonian which may undergo a quantum phase transition (QPT) with the change of a controllable parameter, we obtain a general conclusion that in a sudden quench system, when the final Hamiltonian is fixed, the behavior of the time-averaged expectation of any observable...