共查询到17条相似文献,搜索用时 187 毫秒
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研究匀强电场和谐振场构成的双外场对带电费米粒子系统化学势和Joule-Thomson系数的调控作用.在满足Thomas-Fermi近似的条件下,给出有限温度范围内匀强电场和谐振场中带电费米粒子系统的化学势和内能随温度变化的显式函数关系,分析双外场对带电费米粒子系统焦耳-汤姆逊系数的调控作用.研究结果表明:随着温度的升高,带电费米粒子系统的焦汤系数值逐渐由负变正,且临界温度Tc随外电场增强而降低;在适当温度下,外势场的存在会使带电费米粒子系统产生焦耳-汤姆逊正效应. 相似文献
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从统计物理半经典(Thomas-Fermi)近似方法出发,研究均匀微弱电场中带电费米子体系的热力学性质,推导出了带电费米子体系的热容量和化学势随外电场场强的变化关系,给出了体系的热容量和化学势在高温和低温近似下的解析表达式,进而分析了均匀微弱电场对带电费米子体系热容量和化学势的影响. 相似文献
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从统计物理半经典(Thomas-Fermi)近似方法出发,研究均匀微弱电场中带电费米子体系的热力学性质,推导出了带电费米子体系的热容量和化学势随外电场场强的变化关系,给出了体系的热容量和化学势在高温和低温近似下的解析表达式,进而分析了均匀微弱电场对带电费米子体系热容量和化学势的影响. 相似文献
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采用 B3P86方法计算了C6H6在外电场作用下分子系统的能量及分子轨道能级、谐振频率、CH键离解能和极化率等分子特性;通过跃迁矩阵元计算了各激发态的激发能,吸收及自发辐射系数,从而进一步分析了苯分子的外场效应.对于高分子化合物尤其是具有苯环结构的有机高分子化合物的外场作用特性的研究具有参考价值. 相似文献
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带电粒子在匀强电场中的偏转,是“电场”一章教学的难点.我们在教学中用肥皂泡模拟带电粒子在匀强电场中的偏转实验,收到较好的效果。演示器由匀强电场和发泡器两部分组成.取两片25×40cm~2的铝网(可用收录机用的扬声器装饰网),将其四周边缘分别用火 相似文献
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Jian Peng Yi Huang Yong-Ming Li Jian Jing 《International Journal of Theoretical Physics》2011,50(10):3125-3133
We study noncommutative Chern-Simons mechanics and noncommutative Hall effect by Dirac theory in this paper. The magnetic
field is introduced by means of minimal coupling. We show that the constraint set will enlarge when a dimensionless parameter
takes zero value. In order to illustrate our idea, we study two specific models. One is noncommutative Chern-Simons mechanics
which describes a charged particle on a noncommutative plane interacting with a perpendicular uniform magnetic field. The
other is a charged particle on a noncommutative plane with a background uniform electromagnetic field. We show that when the
dimensionless parameter tends to zero, the particle will live in a lower dimensional space in both models. Noncommutative
Chern-Simons mechanics will reduce to a harmonic oscillator and the classical equations of motion of a charged particle in
the background of a uniform electromagnetic field are governed by classical Hall law when the dimensionless parameter tends
to zero. 相似文献
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Effects of external fields on a two-dimensional Klein-Gordon particle under pseudo-harmonic oscillator interaction 下载免费PDF全文
We study the effects of the perpendicular magnetic and Aharonov-Bohm(AB) flux fields on the energy levels of a two-dimensional(2D) Klein-Gordon(KG) particle subjected to an equal scalar and vector pseudo-harmonic oscillator(PHO).We calculate the exact energy eigenvalues and normalized wave functions in terms of chemical potential parameter,magnetic field strength,AB flux field,and magnetic quantum number by means of the Nikiforov-Uvarov(NU) method.The non-relativistic limit,PHO,and harmonic oscillator solutions in the existence and absence of external fields are also obtained. 相似文献
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Josselin Garnier 《Journal of statistical physics》1998,93(1-2):211-241
This paper investigates the evolution of the state vector of a charged quantum particle in a harmonic oscillator driven by a time-dependent electric field. The external field randomly oscillates and its amplitude is small but it acts long enough so that we can solve the problem in the asymptotic framework corresponding to a field amplitude which tends to zero and a field duration which tends to infinity. We describe the effective evolution equation of the state vector, which reads as a stochastic partial differential equation. We explicitly describe the transition probabilities, which are characterized by a polynomial decay of the probabilities corresponding to the low-energy eigenstates, and give the exact statistical distribution of the energy of the particle. 相似文献
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Effects of a finite number of particles on the thermodynamic properties of a harmonically trapped ideal charged Bose gas in a constant magnetic field 下载免费PDF全文
We investigate the thermodynamic properties of an ideal charged Bose gas confined in an anisotropic harmonic potential and a constant magnetic field. Using an accurate density of states, we calculate analytically the thermodynamic potential and consequently various intriguing thermodynamic properties, including the Bose–Einstein transition temperature, the specific heat, magnetization, and the corrections to these quantities due to the finite number of particles are also given explicitly. In contrast to the infinite number of particles scenarios, we show that those thermodynamic properties,particularly the Bose–Einstein transition temperature depends upon the strength of the magnetic field due to the finiteness of the particle numbers, and the collective effects of a finite number of particles become larger when the particle number decreases. Moreover, the magnetization varies with the temperature due to the finiteness of the particle number while it keeps invariant in the thermodynamic limit N →∞. 相似文献
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以二维旋转简谐振子势为例分析了在BEC中经常用到的旋转势,分析了哈密顿量的表达式,给出了波函数和能量本征值,并注意到了二维旋转简谐振子势与带电粒子在磁场中的情形具有相近的形式. 相似文献
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研究带电粒子在均匀磁场与三维各向同性谐振子场中运动的双波描述,得到了量子结果及其 经典极限,并与纯经典情形比较.
关键词:
双波描述
均匀磁场
谐振子场 相似文献