The TRIQS arbirary X-Crossing Approximation impurity solver (triqs_xca)

Oral-In-person

Abstract

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.

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Publication: J. Kaye, Z. Huang, H.U.R. Strand, D. Golež, Phys. Rev. X 14, 031034 (2024)
Z. Huang, D. Golež, H.U.R. Strand, J. Kaye, arXiv:2503.19727 (accepted in SciPost)

Presenters

  • Hugo Strand

    • Örebro University

Authors

  • Hugo Strand

    • Örebro University

  • Paco Rilloraza

  • Zhen Huang

    • University of California, Berkeley

  • Nils Wentzell

  • Denis Golez

  • Jason Kaye

    • Simons Foundation (Flatiron Institute)