ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

október 18. péntek 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Dóra Balázs (BME TTK, Elméleti Fizika Tanszék):

The Kibble-Zurek scaling at exceptional points

Exceptional points (EPs) are ubiquitous in non-hermitian systems, and
represent the complex counterpart of  critical points. By driving a system
through a critical point at finite rate induces defects, described by the
Kibble-Zurek mechanism, which finds applications in diverse fields of
physics. Here we generalize this to a ramp across an EP. We find that
adiabatic time evolution brings the system into an eigenstate of the final
non-hermitian Hamiltonian and demonstrate that for a variety of drives
through an EP, the defect density obeys a universal scaling form in terms
of the usual critical exponents and the speed of the drive. Defect
production is suppressed compared to the conventional hermitian case as the
defect state can decay back to the ground state close to the EP.

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor