Naslov
Criticality of the random field Ising model in and out of equilibrium: A nonperturbative functional renormalization group description

Autori
Balog, Ivan ; Tarjus, Gilles ; Tissier, Matthieu

Izvornik
Physical review. B (2469-9950) 97 (2018), 9; 094204, 21

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
critical phenomena ; impurities ; nonperturbative renormalization group

Sažetak
We show that, contrary to previous suggestions based on computer simulations or erroneous theoretical treatments, the critical points of the random-field Ising model out of equilibrium, when quasistatically changing the applied source at zero temperature, and in equilibrium are not in the same universality class below some critical dimension $d_{; ; DR}; ; \approx 5.1$. We demonstrate this by implementing a nonperturbative functional renormalization group for the associated dynamical field theory. Above $d_{; ; DR}; ; $, the avalanches, which characterize the evolution of the system at zero temperature, become irrelevant at large distance, and hysteresis and equilibrium critical points are then controlled by the same fixed point. We explain how to use computer simulation and finite-size scaling to check the correspondence between in and out of equilibrium criticality in a far less ambiguous way than done so far.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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