4th Daresbury Questaal School

Overview

The 4th Daresbury Questaal school (postponed from 2020) took place 10-12 May 2022 at Daresbury Laboratory, UK.

Topics covered

• Formal presentation of DMFT as an exact method to solve a local many-body problem; embedding a local Hamiltonian in a nonlocal bath: successes and challenges.
• Solvers for DMFT.
• Two-particle local Green’s functions, and nonlocal response functions.
• Formal presentation of MBPT: the GW approximation and ladder diagrams as the dominant correction.
• Quasiparticle Self-Consistent GW: what it is; why it is needed; successes and limits.
• Combining QSGW and DMFT. Spectral functions, spin, charge, superconducting susceptibilities.
• Use of the Questaal and TRIQS codes.

Practicalities

• The school was sponsored by CECAM (as a Flagship School), CCP9 and Psi-k.

Recordings of selected talks

• Mark van Schilfgaarde, introduction
• Mark van Schilfgaarde, GW and QSGW
• Brian Cunningham, BSE formalism
• François Jamet, DMFT tutorial
• Swagata Acharya, DMFT solvers

Tutorials

• Introduction to lmf
• QSGW and QSGW+BSE dielectric functions
• Triqs

Timetable