Liebich, Marlene and Florian, M. and Nilforoushan, Niloufar and Mooshammer, Fabian and Koulouklidis, Anastasios D. and Wittmann, L. and Mosina, K. and Sofer, Z. and Dirnberger, F. and Kira, M. and Huber, Rupert (2025) Controlling Coulomb correlations and fine structure of quasi-one-dimensional excitons by magnetic order. NATURE MATERIALS, 24 (3). pp. 384-390. ISSN 1476-1122, 1476-4660
Full text not available from this repository. (Request a copy)Abstract
Many surprising properties of quantum materials result from Coulomb correlations defining electronic quasiparticles and their interaction chains. In van der Waals layered crystals, enhanced correlations have been tailored in reduced dimensions, enabling excitons with giant binding energies and emergent phases including ferroelectric, ferromagnetic and multiferroic orders. Yet, correlation design has primarily relied on structural engineering. Here we present quantitative experiment-theory proof that excitonic correlations can be switched through magnetic order. By probing internal Rydberg-like transitions of excitons in the magnetic semiconductor CrSBr, we reveal their binding energy and a dramatic anisotropy of their quasi-one-dimensional orbitals manifesting in strong fine-structure splitting. We switch the internal structure from strongly bound, monolayer-localized states to weakly bound, interlayer-delocalized states by pushing the system from antiferromagnetic to paramagnetic phases. Our analysis connects this transition to the exciton's spin-controlled effective quantum confinement, supported by the exciton's dynamics. In future applications, excitons or even condensates may be interfaced with spintronics; extrinsically switchable Coulomb correlations could shape phase transitions on demand.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | WAALS; DYNAMICS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber Regensburg Center for UltrafastNanoscopy (RUN) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Jul 2026 08:00 |
| Last Modified: | 28 Jul 2026 08:00 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66546 |
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