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Giant effective Zeeman splitting in a monolayer semiconductor realized by spin-selective strong light–matter coupling
Nature Photonics ( IF 35.0 ) Pub Date : 2022-07-07 , DOI: 10.1038/s41566-022-01025-8
T. P. Lyons, D. J. Gillard, C. Leblanc, J. Puebla, D. D. Solnyshkov, L. Klompmaker, I. A. Akimov, C. Louca, P. Muduli, A. Genco, M. Bayer, Y. Otani, G. Malpuech, A. I. Tartakovskii

Strong coupling between light and the fundamental excitations of a two-dimensional electron gas (2DEG) is of foundational importance both to pure physics and to the understanding and development of future photonic nanotechnologies1,2,3,4,5,6,7. Here we study the relationship between spin polarization of a 2DEG in a monolayer semiconductor, MoSe2, and light–matter interactions modified by a zero-dimensional optical microcavity. We find pronounced spin-susceptibility of the 2DEG to simultaneously enhance and suppress trion-polariton formation in opposite photon helicities. This leads to observation of a giant effective valley Zeeman splitting for trion-polaritons (g-factor of >20), exceeding the purely trionic splitting by over five times. Going further, we observe clear effective optical nonlinearity arising from the highly nonlinear behaviour of the valley-specific strong light–matter coupling regime, and allowing all-optical tuning of the polaritonic Zeeman splitting from 4 meV to >10 meV. Our experiments lay the groundwork for engineering topological phases with true unidirectionality in monolayer semiconductors, accompanied by giant effective photonic nonlinearities rooted in many-body exciton–electron correlations.



中文翻译:

通过自旋选择强光-物质耦合实现单层半导体中的巨大有效塞曼分裂

光与二维电子气 (2DEG) 的基本激发之间的强耦合对于纯物理和未来光子纳米技术1,2,3,4,5,6,7的理解和发展都具有重要意义。在这里,我们研究了单层半导体、MoSe 2中 2DEG 的自旋极化与零维光学微腔修饰的光-物质相互作用之间的关系。我们发现 2DEG 具有明显的自旋敏感性,可以同时增强和抑制相反光子螺旋中的三重极化子形成。这导致观察到三角极化子的巨大有效谷塞曼分裂(g-因子> 20),超过纯三子分裂五倍以上。更进一步,我们观察到由谷特定强光物质耦合机制的高度非线性行为引起的明显有效光学非线性,并允许极化子塞曼从 4 meV 分裂到 >10 meV 的全光学调谐。我们的实验为在单层半导体中设计具有真正单向性的拓扑相奠定了基础,伴随着根植于多体激子-电子相关性的巨大有效光子非线性。

更新日期:2022-07-07
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