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Št. zadetkov: 6
Nonequilibrium and statistical properties of isolated quantum many-body systems
Jan Šuntajs, Lev Vidmar
Doktorska disertacija
Oznake: quantum chaos;quantum ergodicity;ergodicity breaking;spectral form factor;spectral statistics;quantum sun model;disordered spin chains;Anderson model;Anderson localization;quantum many-body systems;many-body localization;
In this thesis, we investigate ergodicity breaking transitions in different models of closed quantum systems with quenched disorder. Based on the quantum chaos conjecture, a quantum system is considered ergodic if the statistical properties of its eigenvalues and eigenstates comply with predictions ...
Leto: 2023 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Spektralne lastnosti modela t-J in večdelčna lokalizacija
Jan Šuntajs, Janez Bonča, Lev Vidmar
Magistrsko delo
Oznake: fizika kondenzirane snovi;večdelčna lokalizacija;nered;model t-J;spektralni oblikovni faktor;prepletenostna entropija;
V magistrskem delu preučujemo prehod med ergodično in večdelčno lokalizirano (ang.~\emph{many-body localized}, v nadaljevanju MBL) fazo v modelu $t$-$J$ ob prisotnosti spinskega oziroma potencialnega nereda. Pri tem se osredotočimo na primera dopiranja z eno vrzeljo in tretjinskega dopiranja z vrzel ...
Leto: 2018 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Localization challenges quantum chaos in the finite two-dimensional Anderson model
Jan Šuntajs, Tomaž Prosen, Lev Vidmar
Izvirni znanstveni članek
Oznake: statistična fizika;kvantna statistična mehanika;fizika kondenzirane snovi;lokalizacija;statistical physics;quantum statistical mechanics;condensed matter physics;localization;
It is believed that the two-dimensional (2D) Anderson model exhibits localization for any nonzero disorder in the thermodynamic limit and it is also well known that the finite-size effects are considerable in the weak disorder limit. Here we numerically study the quantum chaos to localization transi ...
Leto: 2023 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Ergodicity breaking transition in finite disordered spin chains
Jan Šuntajs, Janez Bonča, Tomaž Prosen, Lev Vidmar
Izvirni znanstveni članek
Oznake: kvantna statistična mehanika;quantum statistical mechanics;
We study disorder-induced ergodicity breaking transition in high-energy eigenstates of interacting spin-1/2 chains. Using exact diagonalization, we introduce a cost function approach to quantitatively compare different scenarios for the eigenstate transition. We study ergodicity indicators such as t ...
Leto: 2020 Vir: Digitalni repozitorij raziskovalnih organizacij Slovenije
Quantum chaos challenges many-body localization
Jan Šuntajs, Janez Bonča, Tomaž Prosen, Lev Vidmar
Izvirni znanstveni članek
Oznake: kvantna statistična mehanika;kvantni kaos;quantum statistical mechanics;quantum chaos;
Characterizing states of matter through the lens of their ergodic properties is a fascinating new direction of research. In the quantum realm, the many-body localization (MBL) was proposed to be the paradigmatic ergodicity breaking phenomenon, which extends the concept of Anderson localization to in ...
Leto: 2020 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Similarity between a many-body quantum avalanche model and the ultrametric random matrix model
Jan Šuntajs, Miroslav Hopjan, Wojciech De Roeck, Lev Vidmar
Izvirni znanstveni članek
Oznake: kvantna statistična mehanika;quantum statistical mechanics;
In the field of ergodicity-breaking phases, it has been recognized that quantum avalanches can destabilize many-body localization at a wide range of disorder strengths. This has in particular been demonstrated by the numerical study of a toy model, sometimes simply called the “avalanche model” or th ...
Leto: 2024 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Št. zadetkov: 6
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