ELFT HÍRADÓ

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

Meghívó

BME Elméleti Fizika Szeminárium,

mércius 26. péntek 10h15,
online a Microsoft Teams-ben
<https://teams.microsoft.com/l/meetup-join/19%3a35c712c192104aa998ed6bab3f0cbc07%40thread.tacv2/1617779846123?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>
Szász-Schagrin Dávid (BME Elm. Fiz. tanszék, PhD hallgató):
Weak integrability breaking and level spacing distribution

Recently it was suggested that certain perturbations of integrable spin
chains lead to a weak breaking of integrability in the sense that
integrability is preserved at the first order of the coupling. Here we
examine this claim using level spacing distribution. We find that the
volume dependent cross-over between integrable and chaotic statistics is
markedly different between weak and strong breaking of integrability,
supporting the claim that perturbations by generalised currents only break
integrability at higher order. In addition, for the massless case we find
that the critical coupling as a function of the volume L scales with a
1/L^2 law for weak breaking as opposed to the previously found 1/L^3 law
for the strong case.

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor