Title: Modeling Quantum Matter

Speaker: Dr. Indra Dasgupta, IACS, Kolkata

Abstract: In this talk, we shall describe in detail the key ingredients that are necessary to model quantum materials. In particular, we shall illustrate the important role of structure and chemistry in deriving low energy tight- binding Hamiltonian that serve as the single electron part of the many body Hamiltonian like Hubbard and Kanamori models employed to describe emergent properties of quantum materials. We shall show in the strong coupling limit, one can derive spin models, Heisenberg model and in the presence of strong spin-orbit coupling the Kitaev model from Hubbard and Kanamori models respectively. Finally we shall illustrate such models with built in chemical realism help us to understand emergent phases of quantum materials [1], [2], [3],[4].

[1] Ritwik Das et. al. (Preprint) 2022 [2] Subhadeep Bandyopadhyay et. al. Physical Review B 105, 184430 (2022) [3] Atasi Chakraborty et. al. Physical Review B 104, 115106 (2021) [4] S. Kundu et. al. Physical Review Letters 125, 267202 (2020)