NCTS (South)


DATE2013-05-20

TIME12:10

PLACER49223, Second Physics Building , NCKU

FIELDQuantum Information Science

SPEAKER Prof. Ming-Chiang Chung(張明強) - 中興大學物理系

TITLE Quench Dynamics of Topological Maximally-Entangled States

ABSTRACTWe investigate the quench dynamics of the one-particle entanglement spectra (OPES) for systems with topologically nontrivial phases. By using dimerized chains as an example, it is demonstrated that the evolution of OPES for the quenched bipartite systems is governed by an eective Hamiltonian which is characterized by a pseudo spin in a time-dependent pseudo magnetic eld S(k; t). The existence and evolution of the topological maximally-entangled states (tMES) are determined by the winding number of S(k; t) in the k-space. In particular, the tMES survive only if nontrivial Berry phases are induced by the winding of S(k; t). In the innite time limit the equilibrium OPES can be determined by an eective time-independent pseudo magnetic eld Se(k). Furthermore, when tMES are unstable, they are destroyed by quasiparticles within a characteristic timescale in proportional to the system size.