ELFT HÍRADÓ

[Andras Palyi <palyi AT mail.bme.hu>]

Dear Colleagues,

Next Monday Máté Lencsés will give a talk at the BME Exotic Quantum Phases 
seminar:

Speaker: Máté Lencsés (BME)
Title: Entanglement dynamics near a quantum critical point
Time: Feb 17, 2020, Monday, 14:00 (sharp)
Location: seminar room of the theory department (Department of Theoretical 
Physics, Building F, stairway III., 1111 Budapest, Budafoki ut 8.)

Abstract: "The one-dimensional quantum Ising model is one of the most studied 
quantum systems. In a transeverse field, it possesses a quantum critical 
point. For non-critical transverse field it can be described by free massive 
Majorana fermions. With critical transverse field, in the presence of finite 
longitudinal field it can be described by the $E_8$ integrable model. I will 
present our studies on the time evolution of entanglement entropy after a 
global (mass) quench in both cases, comparing scaling field theory results to 
exact and numerical spin chain calculations extrapolated to the scaling 
limit. I will discuss the linear in time growth of entanglement and its 
suppression, and long living entanglement oscillations.

The talk is based on the recent works:
O. A. Castro-Alvaredo, M. Lencsés, I. M. Szécsényi, J. Viti: Entanglement 
Dynamics after a Quench in Ising Field Theory: A Branch Point Twist Field 
Approach, JHEP 1912 (2019) 079, JHEP 2019 (2020) 079, arXiv:1907.11735
O. A. Castro-Alvaredo, M. Lencsés, I. M. Szécsényi, J. Viti: Entanglement 
Oscillations near a Quantum Critical Point, arXiv:2001.10007"

Best regards,
Andras Palyi