检索结果-南通市图书馆

Characterization of ZnO nanowire field-effect transistors exposed to ultraviolet radiation

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2009年第11期18卷 5020-5023页

作者：黎明张海英郭常新徐静波付晓君陈普锋 Institute of Microelectronics Chinese Academy of Sciences department of physic University of Science and Technology of China

A ZnO nanowire （NW） field-effect transistor （FET） is fabricated and characterized, and its characterization of ultraviolet radiation is also investigated. On the one hand, when the radiation time is 5 min, the radiation intensity increases to 5.1μW/cm^2, while the saturation drain current （Idss） of the nanowire FET decreases sharply from 560 to 320 nA. The field effect mobility（μ） of the ZnO nanowire FET drops from 50.17 to 23.82cm^2/（V·s） at VDS= 2.5V, and the channel resistivity of the FET increases by a factor of 2.0n the other hand, when the radiation intensity is 2.5μW/cm^2, the DC performance of the FET does not change significantly with irradiation time （its performances at irradiation times of 5 and 20 min are almost the same）; in particular, the Idss of NW FET only reduces by about 50 nA. Research is underway to reveal the intrinsic properties of suspended ZnO nanowires and to explore their device

关键词： ZnO nanowire suspended field-effect transistor ultraviolet radiation

Characterization of Vacuum Ultraviolet (VUV) Radiation for the Development of a Fluorescent Lamp

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2011年第4期13卷 480-485页

作者： Hasina KHATUN A.K.SHARMA P.K.BARHAI Microwave Tubes Area Central Electronics Engineering Research Institute Applied physic department Birla Institute of Technology

A negative unipolar pulsed voltage is applied to study internal electrical parameters of the xenon filled dielectric barrier discharge （DBD） sources. The VUV radiation emitted from these sources is characterized by means of the photoluminescence intensity of the red phosphor pellet. The red phosphor converts the VUV radiation into visible radiation and the emission spectra include a peak at 619.56 nm. The emission characteristics of the red phosphor are analyzed in terms of the pressure-distance （pd）, rise time and frequency of the pulsed voltage waveform. The emission intensity measured at different operational conditions confirms that the formation and decay of the xenon excimer, Xe2^＊, increase with the increase in reduced electric field, E/N. After exceeding certain limits of E/N, the intensity of Xe2^＊ decreases rapidly.

关键词： dielectric barrier discharge vacuum ultraviolet photoluminescence RGB

Excitation of Light-Induced Acoustic Waves in Doped Lithium Niobate Crystals

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2006年第z1期24卷 264-268页

作者： Huang Wei Wu Zhongkang department of Basic Beijing Institute of Civil Engineering and Architecture Beijing 100044 China Department of Physic Nankai University Tianjin 300071 China

The phenomena of acoustic emission in doped lithium niobate crystals were observed in the process of light-induced quasi-breakdown. It is found that the ultrasonic waves introduce into the crystal have been modulated by the low frequency acoustic waves. Its frequency increases with the rise of the intensity of incident light and its jump period of breakdown is the same as that of the photovoltaic current Ic, the change of light-induced refractive index Δn and the diffracted light intensity L. This effect was explained with the interaction of the three waves and resonant state theory. The experimental results and the theoretical analysis are in conformity.

关键词： photovoltaic current space charge wave light induced quasi-breakdown light induced acoustic effect

The influence of electric field on a parabolic quantum dot qubit

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2009年第2期18卷 446-450页

作者：尹辑文肖景林于毅夫王子武 department of physic and Electronic Information Engineering Chifeng College College of physics and Electronic Information Inner Mongolia Normal University

This paper calculates the time evolution of the quantum mechanical state of an electron by using variational method of Pekar type on the condition of electric-LO-phonon strong coupling in a parabolic quantum dot. It obtains the eigenenergies of the ground state and the first-excited state, the eigenfunctions of the ground state and the first- excited state This system in a quantum dot may be employed as a two-level quantum system qubit. The superposition state electron density oscillates in the quantum dot with a period when the electron is in the superposition state of the ground and the first-excited state. It studies the influence of the electric field on the eigenenergies of the ground state, the first-excited state and the period of oscillation at the different electron-LO-phonon coupling constant and the different confinement length.

关键词： quantum dot quantum information qubit

Molecular Dynamics Simulation of Low-Energy C_(60) in Collision with a Graphite (0001) Surface

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 1995年第12期12卷 751-754页

作者： MAN Zhenyong PAN Zhengying LIU Lei LI Rongwu department of physic 2 Fudan UniversityShanghai 200433 Ion Beam Laboratory Shanghai Institute of MetallurgyAcademia SinicaShanghai 200050 department of physics.Fudan University Shanghai 200433

The collision of C_(60) with a graphite(0001)surface has been investigated by molecular dynamics simulation with TLHL *** an impact energy of 90eV,the C_(60) buckyball first deformed to a disc-like structure and then transformed back to its original shape and recoiled *** dissociation of the C_(60) was observed on the time scale of the *** a single-atom-surface collision,the C_(60)-surface interaction is a highly inelastic process.

关键词： potential. process. collision

The ground-state lifetime of polaron in a parabolic quantum dot

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2008年第6期17卷 2236-2239页

作者：于毅夫肖景林尹辑文王子武 department of physic and Electronic Information Engineering Chifeng College College of physics and Electronic Information Inner Mongolia National University

This paper reports that the ground-state energy of polaron was obtained with strong electron-LO-phonon coupling by using a variational method of the Pekar type in a parabolic quantum dot. Quantum transition is occurred in the quantum system due to the electron-phonon interaction and the influence of temperature. That is the polaron transit from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the change of the polaron lifetime. Numerical calculations are performed and the results illustrate that the ground-state lifetime of the polaron will increase with increasing the ground-state energy of polaron and decrease with increasing the electron-LO-phonon coupling strength, the confinement length of the quantum dot and the temperature.

关键词： quantum dot polaron lifetime

Magnetic flux assisted thermospin transport in a Rashba ring

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2016年第10期37卷 21-24页

作者：梁峰高本领古宇 department of physics Huaiyin Institute of Technology department of physic and Siyuan Laboratory Jinan University

The electron transport through a Rashba ring with a magnetic flux and driven by a temperature difference is investigated. It is found that the spin interference effect induced by the Rashba spin-orbit interaction and by the magnetic flux can break the balance between the spin-up and spin-down component currents in the thermally driven charge current and thus result in a spin current. The analytical derivation and numerical calculations reveal that the magnitude, sign, peaks and spin-polarization of the generated spin current can be readily modulated by the system parameters. In particular, with some choices of the parameters, the spin polarization of the generated spin current can reach 100%, that is, a fully spin-polarized thermospin current can be produced. These results may help the use of the spin-dependent Seebeck effect to generate and manipulate a spin current.

关键词： spin current Seebeck effect Rashba ring

High-energy ion treatments of amorphous As40Se60 thin films for optical applications

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第3期24卷 239-246页

作者： Rashmi Chauhan Arvind Tripathi Krishna Kant Srivastava department of physic DAV College CSJM University Research Foundation for Education and Technology department of physics DBS College CSJM University

The treatment of 100 MeV Ag swift-heavy ion(SHI) irradiation with five different fluences(3 1010, 1 1011, 3 1011, 1 1012, and3 1012ions/cm2) was used to design optical and structural properties of amorphous(a-) As40Se60 chalcogenide thin films. Swanepoel method was applied on transmission measurements to determine the changes in optical bandgap, Tauc parameter and linear optical parameters, i.e., linear optical absorption, extinction coefficient and linear refractive index. Dispersion of the material was determined by Wemple–DiDomenico *** in nonlinear optical parameters of third-order optical susceptibility and nonlinear refractive index were determined using semi-empirical relations. Changes in surface morphology of the films were investigated using SEM observation, which indicated that fluence 3 1012ions/cm2was upper threshold limit for these films for ion treatment. It is observed that optical bandgap reduces from 1.76 eV to 1.64 eV, and nonlinear refractive index increases from 1.31 10 10[esu] to 1.74 10 10[esu]. Linear refractive index initially increases from 2.80 to 3.52(for fluence3 1010ions/cm2) and then keeps decreasing. The observed changes in optical properties upon irradiation were explained in terms of structural rearrangements by Raman measurement. The study was compiled with the previous literature to propose SHI as an effective optical engineering technique to achieve desired changes according to the need of optical/photonic applications.

关键词： Amorphous chalcogenide thin films Ion irradiation Linear and nonlinear optical properties Swanepoel method Semi-empirical relations Raman measurements

Combustion energies and standard molar enthalpies of formation for the complexes of the first-row transitional metal chlorides with L-α-histidine

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2003年第4期48卷 319-322页

作者： GAO Shengli, CHEN Sanping, YANG Xuwu & SHI Qizhen Shaanxi Key Laboratory of physic-Inorganic Chemistry/Chemistry De-partment of Northwest University, Xi抋n 710069, China Correspondence should be addressed to Gao Shengli Shaanxi Key Laboratory of physic-Inorganic Chemistry Chemistry Department of Northwest University Xi’an China

Seven novel solid complexes of the first-row transitional metal with L-a -histidine were synthesized, and their compositions were determined. The constant-volume combustion energies of the complexes were measured by a precision rotation bomb calorimeter. The standard molar enthalpies of combustion and the standard molar enthalpies of formation were calculated. The results indicated that the plots of the standard enthalpies of formation against the atomic number of the metal show a regularity of zigzag.

关键词： transitional metal chloride L-a -histidine solid complex standard molar enthalpies of formation.