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Neutrino Oscillation Induced by Chiral phase Transition

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Chinese Physics Letters 2009年第3期26卷 61-64页

作者：穆成富孙高峰庄鹏飞 Department of Physics Tsinghua University Beijing 100084

Electric charge neutrality provides a relationship between chiral dynamics and neutrino propagation in compact stars. Due to the sudden drop of the electron density at the first-order chiral phase transition, the oscillation for low energy neutrinos is significant and can be regarded as a signature of chiral symmetry restoration in the core of compact stars.

关键词： JONA-LASINIO MODEL MATTER QCD neutrino oscillations quantum chromodynamics chiral dynamics Matter phase transtormations Electron density Oscillations Neutrinos

Dynamic Simulation of Kosterlitz-Thouless Transition in Two-Dimensional Fully Frustrated XY Model

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Chinese Physics Letters 2009年第1期26卷 216-219页

作者：雷晓蔚赵晓雨 Department of Physics Chongqing University of Arts and Sciences Chongqing 402160

Relaxation dynamics of the two-dimensional fully frustrated XY model is investigated with Monte Carlo methods. The simulation focuses on the Kosterlitz Thouless phase transition. From the dynamic scaling behaviour of the magnetization above the transition temperature TKT, the correlating time of the dynamic system is extracted. The transition temperature TKT and static exponent v are then determined.

关键词： NONEQUILIBRIUM CRITICAL-DYNAMICS MONTE-CARLO CRITICAL EXPONENTS phase-TRANSITIONS SQUARE-LATTICE BEHAVIOR SYSTEMS SPIN X-Y model critical exponents Frustration phase transtormations Kosterlitz-Thouless transition Dynamic systems Spin Monte Carlo technique Transition Temperature Dynamic simulation

Evidence for a Bose—Einstein Condensate in Dilute Rb Gas by Absorption Image in a Quadrupole and Ioffe Configuration Trap

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Chinese Physics Letters 2003年第6期20卷 799-801页

作者：王育竹周蜀渝龙全周善钰付海翔 ShanghaiInstituteofOpticsandFineMechanics ChineseAcademyofSciencesShanghai201800

We report the realization of Bose-Einstein condensation (BEC) in dilute rubidium gas. The BEC was achieved in a quadrupole and Ioffe configuration trap. The number of condensed atoms is around 4×104 in total 5×105, and the transition temperature is 250 nK. We have studied the light scattering of the atom cloud and the condensate in a tightly confined magnetic trap. We show that it is possible to use the diffraction patterns in the near-resonant imaging of the trapped cold atomic samples to give the information of the BEC phase transition.

关键词： condensates diffraction patterns Light scattering phase transtormations Gases Transition Temperature Quadrupole Rubidium Bose-Einstein condensates

First-Principles Calculations of Elastic Properties of Cubic Ni2MnGa

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Chinese Physics Letters 2009年第1期26卷 205-208页

作者：陈东肖启敏赵英路余本海王春雷施德恒 College of Physics and Electronic Engineering Xinyang Normal University Xinyang 464000 Department of Foundation The First Aeronautical College of Air Force Xinyang 464000 College of Physics and Electronic Engineering Ludong University Yantai 264025

Dependence of bulk modulus on both pressure and temperature, the elastic constants Cij and the pressure and temperature dependence of normalized volume V/Vo of cubic Ni2MnGa alloy are successfully obtained using the first-principles plane-wave pseudopotential （PW-PP） method as well as the quasi-harmonic Debye model. We analyse the relationship between bulk modulus and temperature up to 800 K and obtain the relationships between bulk modulus B and pressures at different temperatures. It is found that the bulk modulus B increases monotonically with increasing pressure. Moreover, the temperature dependences of the Debye temperature are also analysed. The calculated results are in agreement with the available experimental data and the previous theoreticM results.

关键词： STRUCTURAL-PROPERTIES phase-TRANSFORMATION ALLOYS SOLIDS ORDER MGF2 Pressure Structural properties METAL ALLOY Temperature phase transtormations Bulk modulus Debye temperature solids temperature dependence