Séminaire de groupe
|Localized defects after global quenches: NESS, LQSS, and GGE|
|Equipe 106, Institut Jean Lamour|
|jeudi 28 avril 2016 , 16h00|
|Salle de séminaire du groupe de Physique Statistique|
We consider the non-equilibrium time evolution of a translationally invariant state under a Hamiltonian with a localized defect. We discern the situations where a light-cone spreads out from the defect and separates the system into regions with macroscopically different properties. We identify the light-cone and propose a procedure to obtain a locally-quasi-stationary state describing the late time dynamics of local observables. As an explicit example, we study the time evolution generated by the Hamiltonian of the transverse-field Ising chain with a local defect that cuts the interaction between two sites (a quench of the boundary conditions alongside a global quench). We solve the dynamics exactly and show that the late time properties can be obtained with the general method proposed.