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arXiv 2003.04351quant-phcond-mat.mes-hallphysics.data-an
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一维Dirichlet和Neumann量子阱的Rényi熵和Tsallis熵

Rényi and Tsallis entropies of the Dirichlet and Neumann one-dimensional quantum wells

O. Olendski

摘要:

一维量子阱的Dirichlet和Neumann边界条件(BC)的比较分析提取了这两种几何结构之间的Rényi $R(α)$以及Tsallis $T(α)$熵的相似性和差异。它示出,特别是,对于任何BC的依赖关系的Rényi位置组件上的参数$α$是相同的所有轨道,但最低的Neumann一个相应的功能$R$不受$α$的变化。{ \em动量}熵存在的无量纲Rényi/Tsallis系数的半无限范围的下限$α_{TH}$关键地取决于{ \em位置} BC,对于狄利克雷要求等于四分之一,对于诺依曼要求等于二分之一。当$α$接近这个临界值时,相应的动量泛函确实发散。两个BC的阈值$α_{TH}$之间的间隙导致作为$α$的函数的Rényi不确定性关系的不同行为。对于这两种构型,$α=1/2$的最低能级都使任一种熵不等式饱和,从而证实了早先关于它的讨论,并证明了阈值$α_{TH}$为1/2是任何一维非Dirichlet系统的特征.从数学和物理的角度讨论和分析了其他性质。

英文摘要:

A comparative analysis of the Dirichlet and Neumann boundary conditions (BCs) of the one-dimensional (1D) quantum well extracts similarities and differences of the Rényi $R(α)$ as well as Tsallis $T(α)$ entropies between these two geometries. It is shown, in particular, that for either BC the dependencies of the Rényi position components on the parameter $α$ are the same for all orbitals but the lowest Neumann one for which the corresponding functional $R$ is not influenced by the variation of $α$. Lower limit $α_{TH}$ of the semi infinite range of the dimensionless Rényi/Tsallis coefficient where {\em momentum} entropies exist crucially depends on the {\em position} BC and is equal to one quarter for the Dirichlet requirement and one half for the Neumann one. At $α$ approaching this critical value, the corresponding momentum functionals do diverge. The gap between the thresholds $α_{TH}$ of the two BCs causes different behavior of the Rényi uncertainty relations as functions of $α$. For both configurations, the lowest-energy level at $α=1/2$ does saturate either type of the entropic inequality thus confirming an earlier surmise about it. It is also conjectured that the threshold $α_{TH}$ of one half is characteristic of any 1D non-Dirichlet system. Other properties are discussed and analyzed from the mathematical and physical points of view.

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