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Raman spectrum study of δ-doped GaAs/AlAs multiple-quantum wells

Chinese Physics B 2018年第1期27卷 514-519页

作者：郑卫民丛伟艳李素梅王爱芳李斌黄海北 School of Space Science and Physics Shandong University (Weihai) School of Information Engineering Shandong University (Weihai) Shanghai Institute of Technical Physics Chinese Academy of Sciences School of Chemistry the University of Melbourne

Three samples of GaAs/A1As multiple-quantum wells with different quantum well widths and tS-doped with Be ac- ceptors at the well center were grown on （100） GaAs substrates by molecular beam epitaxy. Polarized Raman spectra were recorded on the three samples at temperatures in a range of 4-50 K in a backscattering configuration. The two branches of coupled modes due to the interaction of the hole intersubband transitions and the quantum-well longitudinal optical （LO） phonon were observed clearly. The evaluation formalism of the Green function was employed and each lineshape of the Raman spectrum of the coupled modes was simulated. The dependence of the peak position of Raman shifts of the two coupled modes as well as the quantum-well LO phonon on the quantum-well size and measured temperature were given, and the coupling interaction mechanism between the hole subband transitions and the quantum-well LO phonon was researched.

关键词： coupled mode Raman spectrum δ-doped GaAs/A1As multiple quantum wells

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Mechanisms of Atlantic Meridional Overturning Circulation(AMOC)Variability in a coupled Ocean–Atmosphere GCM

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Advances in Atmospheric Sciences 2014年第2期31卷 241-251页

作者： Boyin HUANG ZHU Jiang YANG Haijun National Climatic Data Center NOAA Asheville NC 28801 USA Laboratory for Climate and Ocean–Atmosphere Studies and Department of Atmospheric and Oceanic SciencesSchool of Physics Peking University

The mechanisms involved in the variability of Atlantic Meridional Overturning Circulation （AMOC） are studied using a 2000-yr control simulation of the coupled Fast Ocean-Atmosphere model （FOAM）.This study identifies a coupled mode between SST and surface heat flux in the North Atlantic at the decadal timescale,as well as a forcing mode of surface heat flux at the interannual timescale.The coupled mode is regulated by AMOC through meridional heat transport.The increase in surface heating in the North Atlantic weakens the AMOC approximately 10 yr later,and the weakened AMOC in turn decreases SST and sea surface salinity.The decreased SST results in an increase in surface heating in the North Atlantic,thus forming a positive feedback loop.Meanwhile,the weakened AMOC weakens northward heat transport and therefore lowers subsurface temperature approximately 19 yr later,which prevents the AMOC from weakening.In the forcing mode,the surface heat flux leads AMOC by approximately 4 yr.

关键词： Atlantic Meridional Overturning Circulation AMOC variability coupled mode and forcing mode

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Electromagnetic Transparency Realized by Autler-Townes Splitting Based on coupled Field

Electromagnetic Transparency Realized by Autler-Townes Split...

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2021年全国天线年会

作者：陆有素绥化森惠生物能源科技有限责任公司

A special Autler-Townes Splitting(ATS) based on doublet-coupled modes is proposed and analyzed.A transparency window is realized by the coupled-mode-based ATS,which can be excited by simply applying an alternating lattice constant without the change of geometric or constitute parameters of the structure.The correctness of proposed method is proved by simulation and experimental results.This design leads to great benefits for the fabrication of millimeter devices and provides the possibility for the design of high-Q optical devices with a new method.

关键词： coupled mode Autler-Townes Splitting Electromagnetic transparency

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