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Št. zadetkov: 7
Decay and recurrence of non-Gaussian correlations in a quantum many-body system
Thomas Schweigler, Spyros Sotiriadis
Izvirni znanstveni članek
Oznake: statistična fizika;kvantna mehanika;statistical physics;quantum mechanics;
Gaussian models provide an excellent effective description of many quantum many-body systems ranging from condensed-matter systems all the way to neutron stars. Gaussian states are common at equilibrium when the interactions are weak. Recently it was proposed that they can also emerge dynamically fr ...
Leto: 2021 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Correlation functions of the quantum sine-Gordon model in and out of equilibrium
Ivan Kukuljan, Spyros Sotiriadis, G. Takacs
Izvirni znanstveni članek
Oznake: statistična mehanika;kvantna mehanika;kvantna teorija polja;integrabilni modeli;statistical mechanics;quantum mechanics;quantum field theory;integrable models;
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, ...
Leto: 2018 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Out-of-horizon correlations following a quench in a relativistic quantum field theory
Ivan Kukuljan, Spyros Sotiriadis, G. Takacs
Izvirni znanstveni članek
Oznake: kvantna teorija polja;quantum field theory;
One of the manifestations of relativistic invariance in non-equilibrium quantum field theory is the “horizon effect” a.k.a. light-cone spreading of correlations: starting from an initially short-range correlated state, measurements of two observers at distant space-time points are expected to remain ...
Leto: 2020 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Non-equilibrium quantum transport in presence of a defect: the non-interacting case
Marko Ljubotina, Spyros Sotiriadis, Tomaž Prosen
Izvirni znanstveni članek
Oznake: kvantna mehanika;kvantni transport;neravnovesna statistična fizika;quantum mechanics;quantum transport;nonequilibrium statistical physics;localized defects;free fermions;quantum quenches;
We study quantum transport after an inhomogeneous quantum quench in a free fermion lattice system in the presence of a localised defect. Using a new rigorous analytical approach for the calculation of large time and distance asymptotics of physical observables, we derive the exact profiles of partic ...
Leto: 2019 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Signatures of quantum chaos in non-integrable models of quantum field theory
Miha Srdinšek, Tomaž Prosen, Spyros Sotiriadis
Magistrsko delo
Oznake: quantum mechanics;quantum chaos;quantum field theory;sine-Gordon model;Schwinger-Thirring model;massive Thirring model;phi4 model;random matrix theory;
Classical concepts in the theory of dynamical systems, like integrability, periodicity, and chaos, were observed to have quantum analogues, which is reflected in the difference of spectral properties. Although the statement is well-grounded in evidence, we are lacking verifications to a large extent ...
Leto: 2020 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Signatures of chaos in nonintegrable models of quantum field theories
Miha Srdinšek, Tomaž Prosen, Spyros Sotiriadis
Izvirni znanstveni članek
Oznake: kvantna mehanika;kvantni kaos;kvantna teorija polja;quantum mechanics;quantum chaos;quantum field theory;
We study signatures of quantum chaos in $(1+1)D$ quantum field theory (QFT) models. Our analysis is based on the method of Hamiltonian truncation, a numerical approach for the construction of low-energy spectra and eigenstates of QFTs that can be considered as perturbations of exactly solvable model ...
Leto: 2021 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Ergodicity breaking and deviation from eigenstate thermalization in relativistic quantum field theory
Miha Srdinšek, Tomaž Prosen, Spyros Sotiriadis
Izvirni znanstveni članek
Oznake: statistična fizika;termalizacija lastnih stanj;kvantna teorija polja;statistical physics;eigenstate thermalization;quantum field theory;
The validity of the ergodic hypothesis in quantum systems can be rephrased in the form of the eigenstate thermalization hypothesis (ETH), a set of statistical properties for the matrix elements of local observables in energy eigenstates, which is expected to hold in any ergodic system. We test the E ...
Leto: 2024 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Št. zadetkov: 7
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