JQI-QuICS-CMTC seminar

Department of Physics Calendar
Fri, May 18, 2018 4:00 pm - 4:40 pm
PSC 2136


Speaker Name: Sona Najafi

Speaker Institution: Georgetown University

Title: Influence of the initial state on the evolution of quantum spin chains

Abstract: The Lieb-Robinson theorem proves the existence of a maximal velocity for correlations to develop for short-range Hamiltonians. However, the observed propagation velocity is actually state-dependent and non-trivially predictable. We study the light-cone velocity for global quenches in the XY chain starting from a class of initial states. We point out how translation invariance of the initial state can affect the maximal speed at which correlations spread in the system and provide analytic predictions. Analogous considerations are drawn for the evolution of the entanglement entropy and the Loschmidt echo.
1.Light-cone velocities after a global quench in a non-interacting model
K Najafi, MA Rajabpour, J Viti

2.On the possibility of complete revivals after quantum quenches to a critical point
K Najafi, MA Rajabpour
Physical Review B 96 (1), 014305

3.Formation probabilities and Shannon information and their time evolution after a quantum quench in the transverse-field XY chain
K Najafi, MA Rajabpour
Physical Review B 93 (12), 125139

Notes: Snacks and drinks at 4:00 pm, talk at 4:10 pm.