Light-matter interactions in low-dimensional quantum-confined structures can dominate the optical properties of the materials and lead to optoelectronic applications.In anisotropic layered silicon diphosphide(SiP2)cry...Light-matter interactions in low-dimensional quantum-confined structures can dominate the optical properties of the materials and lead to optoelectronic applications.In anisotropic layered silicon diphosphide(SiP2)crystal,the embedded quasi-onedimensional(1D)phosphorus–phosphorus(P–P)chains directly result in an unconventional quasi-1D excitonic state,and a special phonon mode vibrating along the P–P chains,establishing a unique 1D quantum-confined system.Alloying SiP2 with the homologous element serves as an effective way to study the properties of these excitons and phonons associated with the quasi-1D P–P chains,as well as the strong interaction between these quasiparticles.However,the experimental observation and the related optical spectral understanding of SiP2 with isoelectronic dopants remain elusive.Herein,with the photoluminescence and Raman spectroscopy measurements,we demonstrate the redshift of the confined excitonic peak and the stiffening of the phonon vibration mode■of a series of Si(P1−xAsx)2 alloys with increasing arsenic(As)compositions.This anomalous stiffening of■is attributed to the selective substitution of As atoms for P atoms within the P–P chains,which is confirmed via our scanning transmission electron microscopy investigation.Such optical spectra evolutions with selective substitution pave a new way to understand the 1D quantum confinement in semiconductors,offering opportunities to explore quasi-1D characteristics in SiP2 and the resulting photonic device application.展开更多
HTML5(Hyper Text Markup Language 5)技术是新一代Web应用程序构建的基准,它包括了全新更加丰富的标签格式、高效的双向通信机制以及Web化多媒体特性。利用HTML5的这些新特性,可以构建出Web化的智能多媒体终端,实现基于浏览器的多媒体...HTML5(Hyper Text Markup Language 5)技术是新一代Web应用程序构建的基准,它包括了全新更加丰富的标签格式、高效的双向通信机制以及Web化多媒体特性。利用HTML5的这些新特性,可以构建出Web化的智能多媒体终端,实现基于浏览器的多媒体音视频实时通信。基于HTML5技术实现Web化智能多媒体终端具备跨操作系统平台、免安装等优点。通过WebRTC2SIP服务器网关,能够实现基于HTML5的Web智能多媒体终端与传统IMS/LTE多媒体终端之间实时音视频通信。展开更多
基金This research was supported by the National Natural Science Foundation of China(Nos.52072168,51861145201,21733001 and 91750101)the National Key R&D Program of China(Nos.2018YFA0306200 and 2021YFA1202901)Y.F.L.acknowledges financial support by the start-up fund from Chongqing University(No.02110011044171).
文摘Light-matter interactions in low-dimensional quantum-confined structures can dominate the optical properties of the materials and lead to optoelectronic applications.In anisotropic layered silicon diphosphide(SiP2)crystal,the embedded quasi-onedimensional(1D)phosphorus–phosphorus(P–P)chains directly result in an unconventional quasi-1D excitonic state,and a special phonon mode vibrating along the P–P chains,establishing a unique 1D quantum-confined system.Alloying SiP2 with the homologous element serves as an effective way to study the properties of these excitons and phonons associated with the quasi-1D P–P chains,as well as the strong interaction between these quasiparticles.However,the experimental observation and the related optical spectral understanding of SiP2 with isoelectronic dopants remain elusive.Herein,with the photoluminescence and Raman spectroscopy measurements,we demonstrate the redshift of the confined excitonic peak and the stiffening of the phonon vibration mode■of a series of Si(P1−xAsx)2 alloys with increasing arsenic(As)compositions.This anomalous stiffening of■is attributed to the selective substitution of As atoms for P atoms within the P–P chains,which is confirmed via our scanning transmission electron microscopy investigation.Such optical spectra evolutions with selective substitution pave a new way to understand the 1D quantum confinement in semiconductors,offering opportunities to explore quasi-1D characteristics in SiP2 and the resulting photonic device application.
文摘HTML5(Hyper Text Markup Language 5)技术是新一代Web应用程序构建的基准,它包括了全新更加丰富的标签格式、高效的双向通信机制以及Web化多媒体特性。利用HTML5的这些新特性,可以构建出Web化的智能多媒体终端,实现基于浏览器的多媒体音视频实时通信。基于HTML5技术实现Web化智能多媒体终端具备跨操作系统平台、免安装等优点。通过WebRTC2SIP服务器网关,能够实现基于HTML5的Web智能多媒体终端与传统IMS/LTE多媒体终端之间实时音视频通信。
