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arXiv 2004.06189math-phmath.MPmath.PRmath.SP
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离散磁随机薛定谔算符的态密度和离域性

Density of states and Delocalization for discrete magnetic random Schrödinger operators

Simon Becker, Rui Han

摘要:

本文研究了正方形格子和蜂窝格子上的离散磁随机薛定谔算子。对于具有任意有理磁通量的六角晶格上的非随机磁算符,我们证明了中间两个色散面呈现狄拉克锥。然后,我们推导出任意有理磁通量振荡的蜂窝晶格上的状态密度的渐近展开。这使得我们,作为一个推论,严格地研究量子霍尔效应,并得出动态离域的圆锥点附近的无序。对于离散随机薛定谔算子在具有弱磁场的$\mathbb Z^2$ -晶格上的情形,我们得到了类似的结果,接近其谱的底部和顶部。

英文摘要:

We study discrete magnetic random Schrödinger operators on the square and honeycomb lattice. For the non-random magnetic operator on the hexagonal lattice with any rational magnetic flux, we show that the middle two dispersion surfaces exhibit Dirac cones. We then derive an asymptotic expansion for the density of states on the honeycomb lattice for oscillations of arbitrary rational magnetic flux. This allows us, as a corollary, to rigorously study the quantum Hall effect and conclude dynamical delocalization close to the conical point under disorder. We obtain similar results for the discrete random Schrödinger operator on the $\mathbb Z^2$-lattice with weak magnetic fields, close to the bottom and top of its spectrum.

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。

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