arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0705.3791cond-mat.str-el
收藏

一维量子系统中电荷和热输运的可积性特征

Signatures of integrability in charge and thermal transport in 1D quantum systems

Subroto Mukerjee, B. Sriram Shastry

摘要:

可积系统和非可积系统具有非常不同的输运性质。在这项工作中,我们强调这些差异的具体一维模型的相互作用格费米子使用数值精确对角化。我们计算了有限温度绝热刚度(或Drude重量)和等温刚度(或"Meissner“刚度)的电和热输运,也计算了完整的动量和频率依赖的动态电导率$σ(q,ω)$和$κ(q,ω)$。对于可积和不可积可积系统,迈斯纳刚度随系统尺寸的变化迅速趋于零。Drude重量在非可积系统中表现出扩散的迹象,在可积系统中表现出弹道行为。动力学电导率也分别与可积和非可积系统中的弹道和扩散行为一致。

英文摘要:

Integrable and non-integrable systems have very different transport properties. In this work, we highlight these differences for specific one dimensional models of interacting lattice fermions using numerical exact diagonalization. We calculate the finite temperature adiabatic stiffness (or Drude weight) and isothermal stiffness (or ``Meissner'' stiffness) in electrical and thermal transport and also compute the complete momentum and frequency dependent dynamical conductivities $σ(q,ω)$ and $κ(q,ω)$. The Meissner stiffness goes to zero rapidly with system size for both integrable and non-integrable systems. The Drude weight shows signs of diffusion in the non-integrable system and ballistic behavior in the integrable system. The dynamical conductivities are also consistent with ballistic and diffusive behavior in the integrable and non-integrable systems respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑