双外场对费米气体Joule-Thomson效应的调控简

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.

The regulation of the dual external field on the Joule-Thomson effect of Fermi gas

In light of the Thomas-Fermi semi-classical approximation, the regulation of the dual external potential field of the uniform electric field and harmonic oscillator field on the chemical potential and the Joule-Thomson effect of fermi gas was studied and the overt functional relationship between the chemical potential and the internal energy of the charged fermi particle systems of the uniform electric field and harmonic oscillator field with the temperature changes in the limited temperature range was given and the regulation of the dual external potential field on the chemical potential and the Joule-Thomson effect of fermi gas was further analyzed. The research finding show that with the rise of temperature, the value of the Joule-Thomson coefficient of the charged fermi particle systems presents a gradual change from negative to positive and the critical temperature TC declines with the increase of external electric field and that the existence of the external potential may bring about a positive Joule-Thomson effect at an appropriate temperature .