3 papers
cond-mat.str-el2026
Giant Kohn anomaly and chiral phonons in the charge density wave phase of 1H-NbSe
Susy Exists, Sougata Mardanya, Robert Markiewicz +6
Despite extensive investigations, many aspects of charge density waves (CDWs) remain elusive, especially the relative roles of electron-phonon coupling and Fermi surface nesting as…
cond-mat.mtrl-sci2026
On the breakdown of the Born-Oppenheimer approximation in LiH and LiD
Ville J. Härkönen
We compute the ab-initio electron density beyond the strict Born-Oppenheimer approximation in crystalline LiH and LiD with density functional methods. By taking into account the qu…
cond-mat.other2025
Beyond Born-Oppenheimer Green's function theories: absolute and relational
Ville J. Härkönen
We consider quantum field theoretic many-body Green's function approach to solve the Coulomb many-body problem. The earlier beyond Born-Oppenheimer Green's function theories are ab…