Zhao Jiaxin, Fieramosca Antonio, Bao Ruiqi, Dini Kevin, Su Rui, Sanvitto Daniele, Xiong Qihua, Liew Timothy C H
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
CNR NANOTEC Institute of Nanotechnology, via Monteroni, Lecce, Italy.
Nat Commun. 2024 Sep 1;15(1):7601. doi: 10.1038/s41467-024-51612-2.
Transition-metal dichalcogenide monolayers possess large exciton binding energy and a robust valley degree of freedom, making them a viable platform for the development of spintronic devices capable of operating at room temperature. The development of such monolayer TMD-based spintronic devices requires strong spin-dependent interactions and effective spin transport. This can be achieved by employing exciton-polaritons. These hybrid light-matter states arising from the strong coupling of excitons and photons allow high-speed in-plane propagation and strong nonlinear interactions. Here, we demonstrate the operation of all-optical polariton spin switches by incorporating a WS superlattice into a planar microcavity. We demonstrate spin-anisotropic polariton nonlinear interactions in a WS superlattice at room temperature. As a proof-of-concept, we utilize these spin-dependent interactions to implement different spin switch geometries at ambient conditions, which show intrinsic sub-picosecond switching time and small footprint. Our findings offer new perspectives on manipulations of the polarization state in polaritonic systems and highlight the potential of atomically thin semiconductors for the development of next generation information processing devices.
过渡金属二硫属化物单层具有大的激子结合能和强大的谷自由度，使其成为开发能够在室温下运行的自旋电子器件的可行平台。此类基于单层过渡金属二硫属化物的自旋电子器件的开发需要强自旋相关相互作用和有效的自旋输运。这可以通过采用激子极化激元来实现。这些由激子与光子的强耦合产生的混合光物质态允许高速面内传播和强非线性相互作用。在此，我们通过将WS超晶格纳入平面微腔来演示全光极化激元自旋开关的运行。我们在室温下演示了WS超晶格中的自旋各向异性极化激元非线性相互作用。作为概念验证，我们利用这些自旋相关相互作用在环境条件下实现不同的自旋开关几何结构，其显示出固有的亚皮秒开关时间和小尺寸。我们的研究结果为极化激元系统中偏振态的操纵提供了新视角，并突出了原子级薄半导体在下一代信息处理器件开发中的潜力。
