izpis_h1_title_alt

Correlation functions of the quantum sine-Gordon model in and out of equilibrium
ID Kukuljan, Ivan (Avtor), ID Sotiriadis, Spyros (Avtor), ID Takács, Gábor (Avtor)

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Izvleček
Complete information on the equilibrium behavior and dynamics of quantum field theory (QFT) is provided by multipoint correlation functions. However, their theoretical calculation is a challenging problem, even for exactly solvable models. This has recently become an experimentally relevant problem, due to progress in cold-atom experiments simulating QFT models and directly measuring higher order correlations. Here we compute correlation functions of the quantum sine-Gordon model, a prototype integrable model of central interest from both theoretical and experimental points of view. Building upon the so-called truncated conformal space approach, we numerically construct higher order correlations in a system of finite size in various physical states of experimental relevance, both in and out of equilibrium. We measure deviations from Gaussianity due to the presence of interaction and analyze their dependence on temperature, explaining the experimentally observed crossover between Gaussian and non-Gaussian regimes. We find that correlations of excited states are markedly different from the thermal case, which can be explained by the integrability of the system. We also study dynamics after a quench, observing the effects of the interaction on the time evolution of correlation functions, their spatial dependence, and their non-Gaussianity as measured by the kurtosis.

Jezik:Angleški jezik
Ključne besede:statistical mechanics, quantum mechanics, quantum field theory, integrable models
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FMF - Fakulteta za matematiko in fiziko
Status publikacije:Objavljeno
Različica publikacije:Recenzirani rokopis
Leto izida:2018
Št. strani:Str. 110402-1-110402-7
Številčenje:Vol. 121, iss. 11
PID:20.500.12556/RUL-104060 Povezava se odpre v novem oknu
UDK:530.145
ISSN pri članku:0031-9007
DOI:10.1103/PhysRevLett.121.110402 Povezava se odpre v novem oknu
COBISS.SI-ID:3251556 Povezava se odpre v novem oknu
Datum objave v RUL:03.10.2018
Število ogledov:1055
Število prenosov:726
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Gradivo je del revije

Naslov:Physical review letters
Skrajšan naslov:Phys. rev. lett.
Založnik:American Physical Society
ISSN:0031-9007
COBISS.SI-ID:1282575 Povezava se odpre v novem oknu

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:statistična mehanika, kvantna mehanika, kvantna teorija polja, integrabilni modeli

Projekti

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:694544
Naslov:Open many-body non-equilibrium systems
Akronim:OMNES

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