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PHOTOLUMINESCENCE OF TWO-PHASE COEXISTED NONSTOICHIOMETRIC BARIUM TITANATE BY LOW TEMPERATURE HYDROTHERMAL PROCESS

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南京大学学报(自然科学) 1999年第1期 131-133页

作者： Yu Jian Zhang Weifeng Chen Qiang Zhang Mingsheng ( Center for Materials Analysis and national laboratory of solid State microstructures, nanjing university, 2.0093, nanjing, PRC)

ＳｔｒｕｃｔｕｒａｌｓｔｕｄｉｅｓｏｆＢａＴｉＯ３ｕｌｔｒａｆｉｎｅｐｏｗｄｅｒｈａｖｅｓｈｏｗｎｔｈａｔｐａｒｔｉｃｌｅｓｉｚｅｉｎｄｕｃｅｓｐｈａｓｅｔｒａｎｓｆｏｒｍｆｒｏｍｔｅｔｒａｇｏｎａｌｔｏｃｕｂｉｃａ... 详细信息

ＳｔｒｕｃｔｕｒａｌｓｔｕｄｉｅｓｏｆＢａＴｉＯ３ｕｌｔｒａｆｉｎｅｐｏｗｄｅｒｈａｖｅｓｈｏｗｎｔｈａｔｐａｒｔｉｃｌｅｓｉｚｅｉｎｄｕｃｅｓｐｈａｓｅｔｒａｎｓｆｏｒｍｆｒｏｍｔｅｔｒａｇｏｎａｌｔｏｃｕｂｉｃａｔｃｒｉｔｉｃａｌｖａｌｕｅ．［１...

关键词： photoluminescence two phase low temperature hydrothermal

LASER LIFT-OFF OF GaN THIN FILMS FROM SAPPHIRE SUBSTRATES

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 448-452页

作者： J. Xu, R. Zhang, Y.P. Wang, X.Q. Xiu, S.L. Gu, B. Shen, Y. Shi, Z.G. Liu and Y.D. Zheng (Department of Physics and national laboratory of solid State microstructures, nanjing university, nanjing 2.0093, china) Dept. of Phys. Nanjing Univ. Nanjing 210093 China

Gallium Nitride film was successfully separated from sapphire substrate by laser radiation. The absorption of the 248 nm radiation by the GaN at the interface results in rapid thermal decomposition of interfacial layer, yielding metallic Ga and N2 gas. The substrate can be easily removed by heating above the Ga melting point (29°C). X-ray diffraction, atomic force microscopy and photoluminescence of GaN before and after lift-off process have been performed, which demonstrated that the separation and transfer process do not alter the structural quality of the GaN films. And further discussions on the threshold energy and crack-free strategies of laser lift-off process have also been presented.

关键词： Gallium compounds Laser beam effects Nitrides Sapphire Separation

THE　ANISOTROPY　OF　FLUX　DYNAMICS　FOR　YBa2Cu3O7

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南京大学学报(自然科学) 1996年第4期 138-139页

作者： Ding Shiying Ren Cong Yi Huajun (Department of Physics,national laboratory of solid State microstructures,and Center for Advanced Studies in Science and Technology of microstructures,nanjing university,nanjing ,2.0093,PRC)

ＴＨＥＡＮＩＳＯＴＲＯＰＹＯＦＦＬＵＸＤＹＮＡＭＩＣＳＦＯＲＹＢａ２Ｃｕ３Ｏ７ＤｉｎｇＳｈｉｙｉｎｇＲｅｎＣｏｎｇＹｉＨｕａｊｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｆＳ... 详细信息

ＴＨＥＡＮＩＳＯＴＲＯＰＹＯＦＦＬＵＸＤＹＮＡＭＩＣＳＦＯＲＹＢａ２Ｃｕ３Ｏ７ＤｉｎｇＳｈｉｙｉｎｇＲｅｎＣｏｎｇＹｉＨｕａｊｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＮａｔｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｆＳｏｌｉｄＳｔａｔｅＭｉｃｒｏｓｔｒ...

关键词： anisotropy flux creep YBa 2Cu 3O 7 ac susceptibility

Magnetic properties of small Fe clusters: a nonorthogonal Hamiltonian study

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原子与分子物理学报 2000年第4期17卷 583-588页

作者： REN Yun 1,2 ,SUN hou qian 1,2 , WANG Bao lin 1, LUO You hua 1, WANG Guang hou 1(1. national laboratory of solid State microstructures and Department of Physics, nanjing university, nanjing 2.0093 2.Yancheng Institute of Technology, Jia 南京大学固体微结构物理国家重点实验室江苏南京 210093

We calculate the magnetic properties of small Fe N clusters( N =2～7,9,13,15) by using a parameterized Hubbard tight binding spd band model Hamiltonian, with the parameters obtained from nonorthogonal Hamiltonian parameters. the average magnetic moments, and the spin polarized charge distribution within clusters are in agreement with those obtained by first principle and tight binding calculations. The effect of the nonorthogonal basis is discussed.

关键词：铁团磁性 Hubbard模型

Study on impurity desorption induced by femtosecond pulse laser based on a stochastic process model

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Science china(Technological Sciences) 2006年第1期49卷 78-88页

作者： CHI Yinsheng1, LIN Xiaohui1, ZHUANG Ping1 & CHEN Yunfei1,2 1. Department of Mechanical Engineering, Southeast university, nanjing 210096, china 2. Key laboratory of MEMS of china Educational Ministry, Southeast university, nanjing 210096, china Department of Mechanical Engineering Southeast University Nanjing 210096 China Key laboratory of MEMS of china Educational Ministry Southeast University Nanjing 210096 China

With the advantages on non-equilibrium heating and desorption induced by electronic transition, the femtosecond pulse laser introduces a new way for solving the problem of impurity pollution adsorbed on a solid thin film in micro-electro-mechanical systems (MEMS). A model based on stochastic processes was established for stimulated desorption induced by the femtosecond pulse laser to interpret the interaction of the opti-cally excited hot electrons with the adsorbed molecules in a metal substrate. Numerical simulation results reveal a time-dependent desorption probability of adsorbed molecules and indicate that how key parameters of femtosecond pulse laser, such as incident laser energy flux, pulse duration, and wavelength of pulse, have a great effect on the desorption probability.

关键词： desorption, femtosecond pulse laser, stochastic process.

EFFECT OF CURRENT SWEEP RATE ON CRITICAL CURRENT OF SUPERCONDUCTING Ag-Bi2223 TAPES

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南京大学学报(自然科学) 1999年第1期 124-125页

作者： Ding Qi Ding Shiying ( national laboratory of solid State Microstrudures and Deprartment of Physics, nanjing university, 2.0093, nanjing, PRC)

Ｉｎｏｒｄｅｒｔｏｅｓｔａｂｌｉｓｈａｒｅｌｉａｂｌｅｓｔａｎｄａｒｄｍｅａｓｕｒｅｍｅｎｔｐｒｏｃｅｄｕｒｅｄｅｔｅｒｍｉｎｉｎｇｃｒｉｔｉｃａｌｃｕｒ－ｒｅｎｔ（Ｉｃ）ｆｏｒａｓｕｐｅｒｃｏｎｄｕｃｔｉｎｇｍａｔ... 详细信息

Ｉｎｏｒｄｅｒｔｏｅｓｔａｂｌｉｓｈａｒｅｌｉａｂｌｅｓｔａｎｄａｒｄｍｅａｓｕｒｅｍｅｎｔｐｒｏｃｅｄｕｒｅｄｅｔｅｒｍｉｎｉｎｇｃｒｉｔｉｃａｌｃｕｒ－ｒｅｎｔ（Ｉｃ）ｆｏｒａｓｕｐｅｒｃｏｎｄｕｃｔｉｎｇｍａｔｅｒｌａｌ，ａｌｏｔｏｆｅｆｏｒｔ...

关键词： V I curve I c d I /d t superconducting Ag Bi 2223 tape

Provincialism of the late Middle through middle Late Cambrian paraconodonts and protoconodonts

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