2 papers
cond-mat.str-el2026
Recursion method for quench dynamics: strengths and limitations
Ilya Shirokov, Viacheslav Khrushchev, Filipp Uskov +3
The recursion method, which solves coupled Heisenberg equations in a Lanczos operator basis, has recently emerged as a powerful nonperturbative tool for computing dynamical correla…
cond-mat.str-el2025
Pseudomode expansion of many-body correlation functions
Alexander Teretenkov, Filipp Uskov, Oleg Lychkovskiy
We present an expansion of a many-body correlation function in a sum of pseudomodes -- exponents with complex frequencies that encompass both decay and oscillations. The pseudomode…