Publications

Journal articles and preprints · Google Scholar

Preprints

2026 · Preprint

Symmetry-resolved topology from interacting Green's functions

Gaurav Harsha, Selina Dirnböck, Emanuel Gull, Vojtech Vlcek and Dominika Zgid

First submitted November 2025; revised September 2026.

Summary: We combine topological invariants, symmetry-resolved spectra, and orbital occupations from a single interacting Green’s function to diagnose correlated topology. Applied to strained α-Sn within fully self-consistent relativistic GW, this framework connects competing phases to their underlying band-inversion mechanism.

arXiv BibTeX

2026 · Preprint

Hybrid Hamiltonian-diagrammatic quantum impurity solver

Yang Yu, Gaurav Harsha, Lei Zhang, Agnieszka Jażdżewska, Dominika Zgid, Xinyang Dong and Emanuel Gull

Summary: We combine Hamiltonian and diagrammatic approaches to quantum impurity models. A small auxiliary bath makes the remaining problem more amenable to low-order perturbation theory, improving accuracy and convergence in correlated-electron benchmarks.

arXiv BibTeX

Journal articles

2026 · Journal article

Dynamically Corrected Bethe-Salpeter Equation Solver for Self-consistent GW Reference on the Matsubara Frequency Axis

Ming Wen, Gaurav Harsha, and Dominika Zgid

Summary: We present BSE@scGW, a Bethe–Salpeter framework built on a self-consistent GW reference and augmented with a lightweight dynamical screening correction. The method delivers substantially improved excitation energies over conventional BSE approaches, achieving near-benchmark accuracy for singlet and triplet excitations while retaining the efficiency of a static eigenvalue formulation.

J. Chem. Theory Comput. 22, 8257–8273 (2026) arXiv BibTeX

2025 · Journal article

Performance of wave function and Green's function methods for non-equilibrium many-body dynamics

Cian C. Reeves, Gaurav Harsha, Avijit Shee, Yuanran Zhu, Thomas Blommel, Chao Yang, K. Birgitta Whaley, Dominika Zgid and Vojtěch Vlček

Phys. Rev. Res. 7, 023002 (2025) arXiv BibTeX

2025 · Journal article

Green/WeakCoupling: Implementation of fully self-consistent finite-temperature many-body perturbation theory for molecules and solids

Sergei Iskakov, Chia-Nan Yeh, Pavel Pokhilko, Yang Yu, Lei Zhang, Gaurav Harsha, Vibin Abraham, Ming Wen, Munkhorgil Wang, Jacob Adamski, Tianran Chen, Emanuel Gull and Dominika Zgid

Comput. Phys. Commun. 306 (2025) 109380 arXiv BibTeX

2024 · Journal article