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arXiv 2208.04460quant-ph
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费米子谐振子的密度矩阵

Density Matrix of the Fermionic Harmonic Oscillator

Batool A. Abu Saleh

摘要:

利用路径积分技术导出了费米子谐振子密度算符的一种可能表达式。根据格拉斯曼变量,费米子密度算符可以写为:$ρ_F (β)=c^* (β)c(β) \pm c^*(β)c(β)e^{-βω}$,其中+(-)表示所有反周期(周期)轨道的和。我们的密度算子,然后得到通常的费米配分函数描述的费米子振子在热平衡。根据周期轨道$c(β)=c(0)$,得到了费米子分次配分函数.

英文摘要:

The path integral technique is used to derive a possible expression for the density operator of the fermionic harmonic oscillator. In terms of the Grassmann variables, the fermionic density operator can be written as: $ρ_F (β)=c^* (β)c(β) \pm c^*(β)c(β)e^{-βω}$, where +(-) means that the sum over all antiperiodic (periodic) orbits. Our density operator is then used to obtain the usual fermionic partition function which describes the fermionic oscillator in thermal equilibrium. Also, according to the periodic orbit $c(β)=c(0)$, the graded fermionic partition function is obtained.

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