ICANS30

Abstract Details

Shengqiang Zhou

Department head "Semiconductor Materials" at Helmholtz-Zentrum Dresden-Rossendorf

Shengqiang Zhou

Department head "Semiconductor Materials" at Helmholtz-Zentrum Dresden-Rossendorf

Abstract Name:

Exciton-phonon coupling and magnetic transitions in the van der Waals semiconductor CrSBr

Symposium:

Symposium B: Materials Discovery, Modification & Functionalisation

Topic:

B1: Nanoscale Semiconductors

Talk

• Exciton-phonon coupling and magnetic transitions in the van der Waals semiconductor CrSBr

Abstract Contributing Authors:

Kaiman Lin(1,2), Fangchao Long(1), Xiaoxiao Sun(2), Mahdi Ghorbani-Asl(1), Florian Dirnberger(3), Zdenek Sofer(4), Arkady V. Krasheninnikov(1), Stephan Winnerl(2), Manfred Helm(1), Yaping Dan(2), Slawomir Prucnal(1), Shengqiang Zhou(1) 1 Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328 Dresden, Germany 2 University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, China 3 Institute of Applied Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, Germany 4 Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic

Abstract Body:

Layered magnetic materials are becoming a major platform for future spin-based applications. Particularly the air-stable van der Waals compound CrSBr is emerging as a new star in this family [1]. Pristine CrSBr is a semiconductor with a direct bandgap of around 1.35 eV. Bulk CrSBr is antiferromagnetic below its Néel temperature of 132 K [1, 2]. Due to its direct-band gap and magnetic order, pronounced correlations between magnons, photons, electrons, and phonons are revealed in CrSBr. Using low-temperature photoluminescence spectroscopy, we have measured the effective coupling between excitons and phonons in nanometer-thick CrSBr [3]. Upon irradiation by high-energy, non-magnetic ions, CrSBr undergoes a transition from antiferromagnetic to ferromagnetic [4], which suggests the important role of intrinsic defects in altering the magnetic coupling. Therefore, CrSBr presents an excellent avenue to exploit optoelectronic and spintronic applications based on 2D materials.

[1] F. Dirnberger, et al., Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons. Nature 620, 533–5377 (2023).

[2] F. Long, et al., Intrinsic magnetic properties of the layered antiferromagnet CrSBr, Appl. Phys. Lett. 123, 222401 (2023).

[3] K. Lin, et al., Strong Exciton-Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr, ACS Nano 18, 2898-2905 (2024).

[4] F. Long, et al, Ferromagnetic interlayer coupling in CrSBr crystals irradiated by ions, Nano Lett. 23, 8468–8473 (2023).

Submission Type:

Talk

Shengqiang Zhou

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