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arXiv 2201.13197cond-mat.mes-hall
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二维半导体中激子耦合相干磁振子

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, M… 展开作者

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, Xiaoyang Zhu

摘要:

二维(2D)磁性半导体的特征在于具有大振子强度的紧密束缚激子和由于带隙和空间限制的存在而潜在地长寿命的相干磁振子。虽然磁振子和激子在能量上失配了几个数量级,但它们的耦合可以导致对自旋信息的有效光学访问。在这里,我们报告强磁振子激子耦合在二维范德华(vdW)反铁磁(AFM)半导体CrSBr。由上述间隙激发发射的相干磁振子调制层间杂化,这导致激子能量的动态调制。时间分辨激子传感揭示了磁振子可以相干地行进超过7微米,相干时间超过5纳秒。我们观察到这种激子耦合相干磁振子在偶数和奇数层,有和没有补偿磁化,双层极限。考虑到vdW异质结构的多功能性,这些相干2D磁振子可能是光学可访问磁振子和量子互连的基础。

英文摘要:

Two-dimensional (2D) magnetic semiconductors feature both tightly-bound excitons with large oscillator strength and potentially long-lived coherent magnons due to the presence of bandgap and spatial confinement. While 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 van der Waals (vdW) antiferromagnetic (AFM) semiconductor CrSBr. Coherent magnons launched by above-gap excitation modulate the interlayer hybridization, which leads to dynamic modulation of excitonic energies. Time-resolved exciton sensing reveals magnons that can coherently travel beyond 7 micrometer, with coherence time above 5 ns. We observe this exciton-coupled coherent magnons in both even and odd number of layers, with and without compensated magnetization, down to the bilayer limit. Given the versatility of vdW heterostructures, these coherent 2D magnons may be basis for optically accessible magnonics and quantum interconnects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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