arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1610.09367cond-mat.mes-hallcond-mat.othercond-mat.quant-gascond-mat.str-elphysics.chem-ph
收藏

一维激发态维格纳晶体

Excited-State Wigner Crystals in One Dimension

Fergus J. M. Rogers, Pierre-François Loos

摘要:

维格纳晶体(WC)是低密度系统中特有的电子相,特别是在均匀电子气中。自20世纪初引入以来,这个模型对电子结构理论和凝聚态物理的许多方面都至关重要。虽然(最低能量)基态WC(GSWC)已被彻底研究,激发态WC(ESWC)的性质基本上是未知的。为了弥补这一差距,我们提出了一个定义明确的程序,以获得一个完整的家庭ESWC在一维电子气使用的平均场的方法。虽然GSWC是一个相称的晶体(即~密度最大值的数量等于电子的数量),这些ESWC是表现出或多或少的最大值的无公度晶体。有趣的是,它们的能量低于(均匀)费米流体状态。对于这些ESWC中的一些,我们已经发现了不对称的带隙,这将导致各向异性导电性。这些性质与其电子结构中的不寻常特性有关。

英文摘要:

Wigner crystals (WC) are electronic phases peculiar to low-density systems, particularly in the uniform electron gas. Since its introduction in the early twentieth century, this model has remained essential to many aspects of electronic structure theory and condensed-matter physics. Although the (lowest-energy) ground-state WC (GSWC) has been thoroughly studied, the properties of excited-state WCs (ESWCs) are basically unknown. To bridge this gap, we present a well-defined procedure to obtain an entire family of ESWCs in a one-dimensional electron gas using a symmetry-broken mean-field approach. While the GSWC is a commensurate crystal (i.e.~the number of density maxima equals the number of electrons), these ESWCs are incommensurate crystals exhibiting more or less maxima. Interestingly, they are lower in energy than the (uniform) Fermi fluid state. For some of these ESWCs we have found asymmetrical band gaps, which would lead to anisotropic conductivity. These properties are associated to unusual characteristics in their electronic structure.

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。

↑