Faria Junior, Paulo E. and Hernangomez-Perez, Daniel and Amit, Tomer and Fabian, Jaroslav and Refaely-Abramson, Sivan (2025) Generalized many-body exciton g factors: Magnetic hybridization and nonmonotonic Rydberg series in monolayer WSe2. PHYSICAL REVIEW B, 112 (24): L241404. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
The magneto-optical response of excitons in monolayer transition metal dichalcogenides is governed by a complex interplay of Bloch-state quantum geometry-reflected in the electronic magnetic moment-coupled with interband mixing and many-body interactions. Here, we develop a robust and general first-principles framework for many-body exciton g factors (magnetic moments) by incorporating off-diagonal terms for the spin and orbital angular momenta of single-particle bands and many-body states for magnetic fields pointing in arbitrary spatial directions. We implement our framework using many-body perturbation theory via the GW-Bethe-Salpeter equation and supplement our analysis with robust symmetry-based models. Focusing on the archetypal monolayer WSe2, we accurately reproduce the known results of the low-energy excitons including the Zeeman splitting and the dark/gray exciton brightening. Furthermore, our theory naturally reveals the magnetic-field hybridization of higher-energy excitons (s, p, and d like) and shows that the magnetic moments of nodal excitons (p and d like) do not acquire additional contributions of +/- mj mu B (mj = 1, 2), characteristic of the hydrogenic picture. Our general approach also allows us to resolve the long-standing puzzle of the experimentally measured nonmonotonic Rydberg series (1s - 4s) of exciton g factors. Our framework offers a comprehensive approach to investigate, rationalize, and predict the nontrivial interplay between magnetic fields, angular momenta, and many-body exciton physics in van der Waals systems, offering different opportunities to probe signatures of quantum geometry within many-body states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-HOLE EXCITATIONS; OPTICAL-SPECTRA; QUASI-PARTICLE; OPTOELECTRONICS; SEMICONDUCTORS; PSEUDOSPIN; LAYER; MOS2 |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 08:52 |
| Last Modified: | 15 Jul 2026 08:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66845 |
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