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Band structure and absorption coefficient in GaN/AlGaN quantum wires

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Chinese Physics B 2010年第7期19卷 479-483页

作者：姚文杰俞重远刘玉敏 Key Laboratory of Information Photonics and Optical Communications Ministry of EducationBeijing University of Posts and Telecommunications

The band structures of rectangular GaN/AlGaN quantum wires are modeled by using a parabolic effective-mass theory. The absorption coefficients are calculated in a contact-density matrix approach based on the band structure. The results obtained indicate that the peak absorption coefficients augment with the increase of the injected carrier density, and the optical gain caused by interband transition is polarization anisotropic. For the photon energy near 1.55 eV, we can obtain relatively large peak gain. The calculations support the previous results published in the recent literature.

关键词： absorption coefficient gain polarization anisotropic quantum wires

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Fabrication and Characterization of Well-Aligned Zn1-xMnxO Nanorods

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Chinese Physics Letters 2006年第3期23卷 716-719页

作者：常永勤张洪洲龙毅叶荣昌 School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 Department of Electronics and Material Engineering Research School of Physical Science and Engineering Australian National University Australia

Well-Migned Zn1-xMnxO nanorods have been synthesized successfully on bare silicon substrates by a simple evaporation method without using any catalyst. X-ray diffraction and electron microscopy studies demonstrate that the as-grown nanorods are of single wurtzite phase with a preferential growth direction along their c- axes, Quantitative energy-dispersive spectrum analysis reveals that the concentration of manganese is around 4 at,%, Magnetic measurements show the single-phase Zn1-xMnxO nanorod arrays exhibiting the paramagnetic behaviour. Photolumlnescence spectra demonstrate that the Zn1-xMnxO nanorods preserve ultraviolet emission at room temperature.

关键词： DILUTED MAGNETIC SEMICONDUCTORS DOPED ZNO FILMS THIN-FILMS ROOM-TEMPERATURE quantum wires ZINC OXIDE FERROMAGNETISM SPECTRA AMBIENT GROWTH

Acoustic Phonon Thermal Transport through a Nanostructure

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Chinese Physics Letters 2006年第9期23卷 2522-2525页

作者：李文霞柳天宇刘昌龙 Department of Applied Physics Tianjin University Tianjin 300072

Using the scattering matrix method, we investigate the thermal transport m a nanostructure at low temperarures. It is found that phonon transport exhibits some novel and interesting features： resonant transmission, resonant reflection, and small thermal conductance. A comparison between thermal conductances is performed when stress-free and hard-wall boundary conditions are applied for acoustic modes, respectively. The result indicates that the characteristics of the thermal conductance versus temperature for different types of boundary conditions are qualitatively different.

关键词： ELECTRON-TRANSPORT HEAT-CONDUCTION quantum wires SUPERLATTICES MODE TEMPERATURE NANOwires

THz-field-induced electronic transmission step-structure for a quantum wire

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Chinese Physics B 2004年第9期13卷 1531-1536页

作者：肖贤波周光辉杨谋李源徐志峰 DepartmentofPhysics HunanNormalUniversityChangsha410081China NationalLaboratoryofSuperlatticesandMicrostructures InstituteofSemiconductorsChineseAcademyofSciencesBeijing100083China

We study theoretically the low-temperature electronic transport property of a straight quantum wire under the irradiation of a finite-range transversely polarized external terahertz (THz) electromagnetic (EM) field. Using the free-electron model and the scattering matrix approach, we show an unusual behaviour of the electronic transmission of this system. A sharp step-structure appears in the electronic transmission probability as the EM field strength increases to a threshold value when a coherent EM field is applied. We demonstrate that this effect physically comes from the inelastic scattering of electrons with lateral photons through intersubband transitions.

关键词： quantum wires THz electromagnetic field electronic transmission scattering matrix

Experimental review on Majorana zero-modes in hybrid nanowires

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Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 38-53页

作者： Ji-Bang Fu Bin Li Xin-Fang Zhang Guang-Zheng Yu Guang-Yao Huang Ming-Tang Deng Institute for quantum Information&State Key Laboratory of High Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China

As the condensed matter analog of Majorana fermion, the Majorana zero-mode is well known as a building block of fault-tolerant topological quantum computing. This review focuses on the recent progress of Majorana experiments, especially experiments about semiconductor-superconductor hybrid devices. We first sketch Majorana zero-mode formation from a bottom-up view,which is more suitable for beginners and experimentalists. Then, we survey the status of zero-energy state signatures reported recently, from zero-energy conductance peaks, the oscillations, the quantization, and the interactions with extra degrees of freedom. We also give prospects of future experiments for advancing one-dimensional semiconductor nanowire-superconductor hybrid materials and devices.

关键词： electronic transport in nanoscale materials and structures quantum wires proximity efect superconducting low-dimensional structures

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InAs wires on InP (001)

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Journal of Semiconductors 2006年第2期27卷 197-203页

作者：吴巨王占国中国科学院半导体研究所半导体材料科学实验室北京100083

The heterostructure of InAs/In0.52Al0.48As/InP is unique in that InAs wires instead of dots self-assemble in molecular beam epitaxy. These InAs wires have some distinctive features in their growth and structure. This paper summarizes the investigations of the growth and structural properties of InAs wires that have been performed in our laboratory recently.

关键词： quantum wires InAs MBE

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