二维材料中的量子等离激元  

Quantum Plasmon Polariton in Two-dimensional Material

作　　者：冀峰洲 安钧鸿 JI Feng-zhou;AN Jun-hong(School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学,物理科学与技术学院,甘肃兰州730000

出　　处：《量子光学学报》2023年第1期85-95,共11页Journal of Quantum Optics

基　　金：国家自然科学基金(11875150,11834005,12047501)。

摘　　要：作为光与石墨烯中的传导电子在其表面形成的准粒子,量子等离激元因其展示出的对光超越衍射极限的强束缚特性而在发展量子互联器件方面有很大的应用前景。然而石墨烯对量子等离激元显著的吸收通常会导致其所介导的量子信息发生耗散,这极大地限制了其应用。本文我们通过研究量子辐射体和单层石墨烯表面的量子等离激元的近场强耦合,提出了一个克服损耗量子等离激元对辐射体量子相干性破坏作用的物理机制:我们发现随着量子辐射体和石墨烯之间距离的减小,它们形成的总系统能谱中会出现一个束缚态,此时辐射体量子信息的完全耗散将被有效抑制,且最终可以持续保持到稳态。我们的结论提供了一个抑制损耗量子等离激元对辐射体量子信息破坏作用的行之有效的方法,这为发展量子激元器件提供了一定的理论基础。As a quasiparticle formed by light and conduction electrons in graphene,surface plasmon polaritons(SPPs)due to their tight confinement to light and long propagation distances are promising for developing quantum interconnect devices.However,the significant damping of SPPs in the material generally causes the loss of quantum information,which greatly hinders its application.We here propose a mechanism to overcome the destructive effect of the damping SPP on the dynamics of a quantum emitter(QE).Via investigating the near-field coupling between QE and the SPP in a graphene nanodisk,we find that,with the complete dissipation of the QE effciently avoided,quantum information of QE can be stabilized even to its steady state.This is caused by that,with decreasing the QE-graphene distance,the QE becomes so hybridized with the SPP that one bound state is formed between them.Our result supplies a useful way to avoid the impact of SPPs damping,which lays a foundation for developing quantumpolaritonic devices.

关 键 词：量子等离激元 石墨烯 量子辐射体 束缚态 

分 类 号：TB383[一般工业技术—材料科学与工程]