Exciton-coupled coherent magnons in a 2D semiconductor

Youn Jue Bae, Jue Wang, Allen Scheie, Junwen Xu, Daniel G. Chica, Geoffrey M. Diederich, John Cenker, Michael E. Ziebel, Yusong Bai, Haowen Ren, Cory R. Dean, Milan Delor, Xiaodong Xu, Xavier Roy, Andrew D. Kent and Xiaoyang Zhu ()
Additional contact information
Youn Jue Bae: Columbia University
Jue Wang: Columbia University
Allen Scheie: Oak Ridge National Laboratory
Junwen Xu: New York University
Daniel G. Chica: Columbia University
Geoffrey M. Diederich: University of Washington
John Cenker: University of Washington
Michael E. Ziebel: Columbia University
Yusong Bai: Columbia University
Haowen Ren: New York University
Cory R. Dean: Columbia University
Milan Delor: Columbia University
Xiaodong Xu: University of Washington
Xavier Roy: Columbia University
Andrew D. Kent: New York University
Xiaoyang Zhu: Columbia University

Nature, 2022, vol. 609, issue 7926, 282-286

Abstract: Abstract The recent discoveries of two-dimensional (2D) magnets1–6 and their stacking into van der Waals structures7–11 have expanded the horizon of 2D phenomena. One exciting application is to exploit coherent magnons12 as energy-efficient information carriers in spintronics and magnonics13,14 or as interconnects in hybrid quantum systems15–17. A particular opportunity arises when a 2D magnet is also a semiconductor, as reported recently for CrSBr (refs. 18–20) and NiPS3 (refs. 21–23) that feature both tightly bound excitons with a large oscillator strength and potentially long-lived coherent magnons owing to the bandgap and spatial confinement. Although magnons and excitons are energetically mismatched by orders of magnitude, their coupling can lead to efficient optical access to spin information. Here we report strong magnon–exciton coupling in the 2D A-type antiferromagnetic semiconductor CrSBr. Coherent magnons launched by above-gap excitation modulate the exciton energies. Time-resolved exciton sensing reveals magnons that can coherently travel beyond seven micrometres, with a coherence time of above five nanoseconds. We observe these exciton-coupled coherent magnons in both even and odd numbers of layers, with and without compensated magnetization, down to the bilayer limit. Given the versatility of van der Waals heterostructures, these coherent 2D magnons may be a basis for optically accessible spintronics, magnonics and quantum interconnects.

Date: 2022
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DOI: 10.1038/s41586-022-05024-1

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