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Št. zadetkov: 4
Stability and complexity of global iterative solvers for the Kadanoff-Baym equations
Jože Gašperlin, Denis Golež, Jason Kaye
Izvirni znanstveni članek
Oznake: Andersonov model;Greenove funkcije;Mottovi izolatorji;Anderson model;Green's functions;Mott insulators;
Although the Kadanoff-Baym equations are typically solved using time-stepping methods, iterative global-in-time solvers offer potential algorithmic advantages, particularly when combined with compressed representations of two-time objects. We examine the computational complexity and stability of sev ...
Leto: 2026 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Chirped amplitude mode in photoexcited superconductors
Thomas Blommel, Jason Kaye, Yuta Murakami, Emanuel Gull, Denis Golež
Izvirni znanstveni članek
Oznake: fizika kondenzirane snovi;superprevodnost;interakcije svetloba-snov;condensed matter physics;superconductivity;light-matter interactions;
Using a state-of-the-art numerical scheme, we show that the Higgs mode under excitation exhibits chirped oscillations and exponential decay when fluctuations are included. This is in stark contrast to conventional BCS collisionless dynamics which predict power-law decay and the absence of chirping. ...
Leto: 2025 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Automated evaluation of imaginary time strong coupling diagrams by sum-of-exponentials hybridization fitting
Zhen Huang, Denis Golež, Hugo U. R. Strand, Jason Kaye
Izvirni znanstveni članek
Oznake: fizika kondenzirane snovi;kvantna fizika;večdelčni sistemi;Hubbardov model;Andersonov model;condensed matter physics;quantum physics;many-body systems;Hubbard model;Anderson model;
We present an efficient separation of variables algorithm for the evaluation of imaginary time Feynman diagrams appearing in the bold pseudo-particle strong coupling expansion of the Anderson impurity model. The algorithm uses a fitting method based on AAA rational approximation and numerical optimi ...
Leto: 2025 Vir: Fakulteta za matematiko in fiziko (UL FMF)
H-NESSi: the hierarchical non-equilibrium systems simulation package
Thomas Blommel, Jeremija Kovačević, Jason Kaye, Emanuel Gull, Jakša Vučičević, Denis Golež
Izvirni znanstveni članek
Oznake: numerične simulacije;neravnovesna dinamika;kvantni večdelčni sistemi;Keldyshev formalizem;Kadanoff-Baymove enačbe;numerical simulations;nonequilibrium dynamics;quantum many-body problems;Keldysh formalism;Kadanoff-Baym equations;hierarchical low-rank compression;
We present H-NESSi (The Hierarchical Non-Equilibrium Systems Simulation package), an open-source software package for solving the Kadanoff-Baym equations (KBE) of nonequilibrium Green’s function (NEGF) theory using hierarchical low-rank compression techniques. The simulation of correlated quantum sy ...
Leto: 2026 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Št. zadetkov: 4
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