Magnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime

Tingting Wang; Dingyang Zhang; Shiqi Yang; Zhongchong Lin; Quan Chen; Jinbo Yang; Qihuang Gong; Zuxin Chen; Yu Ye; Wenjing Liu

doi:10.1038/s41467-023-41688-7

Magnetically-dressed CrSBr exciton-polaritons in ultrastrong coupling regime

Nat Commun. 2023 Sep 25;14(1):5966. doi: 10.1038/s41467-023-41688-7.

Authors

Tingting Wang^#^{1

2}, Dingyang Zhang^#¹, Shiqi Yang^#^{1

3}, Zhongchong Lin¹, Quan Chen⁴, Jinbo Yang¹, Qihuang Gong^{1

5

6}, Zuxin Chen⁷, Yu Ye^{8

9

10

11}, Wenjing Liu^{12

13

14}

Affiliations

¹ State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China.
² Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China.
³ Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.
⁴ School of Semiconductor Science and Technology, South China Normal University, Foshan, 528225, China.
⁵ Yangtze Delta Institute of Optoelectronics, Peking University, Nantong, 226010, China.
⁶ Liaoning Academy of Materials, Shenyang, 110167, China.
⁷ School of Semiconductor Science and Technology, South China Normal University, Foshan, 528225, China. chenzuxin@m.scnu.edu.cn.
⁸ State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China. ye_yu@pku.edu.cn.
⁹ Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China. ye_yu@pku.edu.cn.
¹⁰ Yangtze Delta Institute of Optoelectronics, Peking University, Nantong, 226010, China. ye_yu@pku.edu.cn.
¹¹ Liaoning Academy of Materials, Shenyang, 110167, China. ye_yu@pku.edu.cn.
¹² State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China. wenjingl@pku.edu.cn.
¹³ Yangtze Delta Institute of Optoelectronics, Peking University, Nantong, 226010, China. wenjingl@pku.edu.cn.
¹⁴ Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China. wenjingl@pku.edu.cn.

^# Contributed equally.

Abstract

Over the past few decades, exciton-polaritons have attracted substantial research interest due to their half-light-half-matter bosonic nature. Coupling exciton-polaritons with magnetic orders grants access to rich many-body phenomena, but has been limited by the availability of material systems that exhibit simultaneous exciton resonances and magnetic ordering. Here we report magnetically-dressed microcavity exciton-polaritons in the van der Waals antiferromagnetic (AFM) semiconductor CrSBr coupled to a Tamm plasmon microcavity. Using angle-resolved spectroscopy, we reveal an exceptionally high exciton-photon coupling strength, up to 169 meV, demonstrating ultrastrong coupling that persists up to room temperature. By performing temperature-dependent spectroscopy, we show the magnetic nature of the exciton-polaritons in CrSBr microcavity as the magnetic order changes from AFM to paramagnetic. By applying an out-of-plane magnetic field, we achieve effective tuning of the polariton energy while maintaining the ultrastrong exciton-photon coupling strength. We attribute this to the spin canting process that modulates the interlayer exciton interaction.

Abstract

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