Optically induced electron spin currents in the Kretschmann configuration

Self-Assembled Ligand-Capped Plasmonic Au Nanoparticle Films in the Kretschmann Configuration for Sensing of Volatile Organic Compounds

Films of close-packed Au nanoparticles are coupled electrodynamically through their collective plasmon resonances. This collective optical response results in enhanced light-matter interactions, which can be exploited in various applications. Here, we demonstrate their application in sensing volatile organic compounds, using methanol as a test-case. Ordered films over several cm2 were obtained by interfacial self-assembly of colloidal Au nanoparticles (~10 nm diameter) through controlled evaporation of the solvent. Even though isolated nanoparticles of this size are inherently non-scattering, …

Optically controlled polariton condensate molecules

A condensed matter platform for analogue simulation of complex two-dimensional molecular bonding configurations, based on optically trapped exciton-polariton condensates is proposed. The stable occupation of polariton condensates in the excited states of their optically configurable potential traps permits emulation of excited atomic orbitals. A classical mean field model describing the dissipative coupling mechanism between p-orbital condensates is derived, identifying lowest threshold condensation solutions as a function of trap parameters corresponding to bound and antibound $π$ and $σ$ bon…

Optically and electrically controllable adatom spin-orbital dynamics in transition metal dichalcogenides

We analyze the interplay of spin-valley coupling, orbital physics and magnetic anisotropy taking place at single magnetic atoms adsorbed on semiconducting transition-metal dichalcogenides, MX$_2$ (M = Mo, W; X = S, Se). Orbital selection rules turn out to govern the kinetic exchange coupling between the adatom and charge carriers in the MX$_2$ and lead to highly orbitally dependent spin-flip scattering rates, as we illustrate for the example of transition metal adatoms with $d^9$ configuration. Our ab initio calculations suggest that $d^9$ configurations are realizable by single Co, Rh, or Ir …

光学可调量子点中的关联电子：构建电子二聚体分子

Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule

我们观察到GaAs半导体量子点中由两个电子形成的分子二聚体的低激发态，量子点中受限电子的数目可以通过光照射来调节。通过采用非弹性光散射，我们确定了壳层间激发在一个电子制度和不同的自旋和电荷模式的相互作用少体配置。在两个电子的情况下，与组态相互作用计算的比较，使我们能够链接所观察到的激发与呼吸模式的分子二聚体，并确定单重态-三重态能量分裂。

Optically controllable coupling between edge and topological interface modes of graphene metasurfaces

Nonlinear topological photonics has been attracting increasing research interest, as it provides an exciting photonic platform that combines the advantages of active all-optical control offered by nonlinear optics with the unique features of topological photonic systems, such as topologically-protected defect-immune light propagation. In this paper, we demonstrate that topological interface modes and trivial edge modes of a specially designed graphene metasurface can be coupled in a tunable and optically controllable manner, thus providing an efficient approach to transfer optical power to top…

磁场对电子-介子系统中光子回波的控制：相干态在光学可达态和不可达态之间的混洗

Magnetic field control of photon echo in the electron-trion system: Shuffling of coherences between optically accessible and inaccessible states

本文报道了磁场引起的CdTe/（Cd，Mg）Te半导体量子阱中带负电荷激子的光子回波信号的振荡。振荡信号是由于电子自旋绕横向磁场的拉莫尔旋进引起的，并且敏感地取决于激发脉冲和重聚焦脉冲的偏振配置。根据两个脉冲之间的时间延迟和磁场强度，回波幅度可以从最大值完全调谐到零。用考虑电子和三电子自旋能级结构的光学布洛赫方程解释了这些结果。