Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 51: Correlated Electrons: Method Development II
TT 51.12: Talk
Wednesday, March 11, 2026, 18:00–18:15, HSZ/0101
The TRIQS arbirary X-Crossing Approximation impurity solver (triqs_xca) — •Hugo U. R. Strand1, Paco Rilloraza2, Zhen Huang3, Nils Wentzell4, Denis Golež5, and Jason Kaye4 — 1Örebro University, Örebro, Sweden — 2New York University, New York, USA — 3University of California, Berkeley, USA — 4Flatiron Institute, Simons Foundation, New York, USA — 5Jožef Stefan Institute, Ljubljana, Solvenia
The triqs_xca solver is the latest quantum impurity solver addition to the Toolbox for Research on Interacting Quantum Systems (TRIQS) based on the bold hybridization expansion, a.k.a. the X:th order Crossing Approximation (XCA). Using the sum-of-exponentials trick we acheive parametrically better computational complexity compared to direct integration and the Discrete Lehmann Representation (DLR) is employed for fast convolutions as well as for representing response functions. The solver is open source and distributed as part of the TRIQS project, see github.com/TRIQS/xca.
Keywords: Anderson Impurity Model; Hybridization expansion; Discrete Lehmann Representation; Dynamical Mean-Field Theory