ELFT HÍRADÓ

[Janos Asboth <asboth AT phy.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

szeptember 18. péntek 10h15,
online a Microsoft Teamsben, Join Microsoft Teams Meeting
<https://teams.microsoft.com/l/meetup-join/19%3a05afef914032430f88fd65b6e3a17fbd%40thread.tacv2/1600238294383?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>

Lencsés Máté (BME TTK, Elméleti Fizika Tanszék):

Time evolution of entanglement after quenching quantum spin chains

In the quantum quench scenario one starts from the ground state of an
initial Hamiltonian, then suddenly changes a parameter of the system, and
studies the time evolution generated by the new Hamiltonian. The
propagation of entanglement through the system is of particular interest.
In this talk I will present results for the time evolution of Rényi and von
Neumann entropies after quenching the magnetic field in Ising and three
state Potts spin chains. Exact and numerical results from the chain are in
excellent agreement with branch point twist field calculations in the
scaling limit field theory in certain cases. I will point out that entropy
generation rates are related to order parameter relaxation rates allowing
for a simple experimental observation of the "dynamical Gibbs effect". I
will present a conjecture for this relation in the absence of explicit
symmetry breaking based on twist field arguments, together with numerical
verification.


Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor