Non-equilibrium transport in d-dimensional non-interacting Fermi gases

Non-equilibrium transport in d-dimensional non-interacting Fermi gases
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d 维非相互作用费米气体中的非平衡输运

DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
Gabriele Martelloni
Gabriele Martelloni
中科院分区:
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文献类型:
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作者:
M. Collura;Gabriele Martelloni

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我们在非相对论和相对论情况下都考虑 d 维中的非相互作用费米气体。尺寸 Ld 的系统最初被制备成两半 ℒ ?> 和 ℛ ?>,每一半分别在两个不同的温度 Tℒ ?> 和 Tℛ ?> 下热化。在时间 t = 0 时,两半接触,整个系统统一演化。我们表明,在热力学极限下,粒子和能量密度的时间演化可以通过半经典方法完美地描述,该方法允许分析评估相应的稳态电流。特别是,在非相对论性费米子的情况下,我们发现粒子和能量流的低温行为与系统的维数 d 无关,与差值 Tℒ2−Tℛ2 ?> 成正比。仅在一个空间维度 (d = 1) 中,非相对论情况的结果与无质量相对论情况一致
We consider a non-interacting Fermi gas in d dimensions, both in the non-relativistic and relativistic case. The system of size Ld is initially prepared into two halves ℒ ?> and ℛ ?>, each of them thermalized at two different temperatures, Tℒ ?> and Tℛ ?> respectively. At time t = 0 the two halves are put in contact and the entire system is left to evolve unitarily. We show that, in the thermodynamic limit, the time evolution of the particle and energy densities is perfectly described by a semiclassical approach which permits to analytically evaluate the corresponding stationary currents. In particular, in the case of non-relativistic fermions, we find a low-temperature behavior for the particle and energy currents which is independent from the dimensionality d of the system, being proportional to the difference Tℒ2−Tℛ2 ?>. Only in one spatial dimension (d = 1) do the results for the non-relativistic case agree with the massless relativistic ones
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影响因子: 19.6
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