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arXiv 2005.10336math-phmath.MPquant-ph
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含二维吸引高斯杂质的零厚度抛物量子阱中的Birman-Schwinger算符

The Birman-Schwinger Operator for a Parabolic Quantum Well in a Zero-Thickness Layer in the Presence of a Two-Dimensional Attractive Gaussian Impurity

Sergio Albeverio, Silvestro Fassari, Manuel Gadella, Luis M. Nieto, Fabio Rinaldi

摘要:

本文考虑量子力学粒子在无限薄的层中运动,该层受$x$ -方向抛物阱的约束,并且存在由吸引高斯势模型化的杂质.我们调查的Birman-Schwinger算子相关的模型假设层内的高斯杂质的存在下,并证明这样的积分算子是希尔伯特-施密特,它允许使用修改后的Fredholm行列式,以计算所创建的杂质的束缚态。此外,我们考虑高斯势在$x$方向退化为$δ$势和在$y$方向退化为高斯势的情况.我们构造了相应的自伴哈密顿量,并证明了它是具有适当缩放的高斯势的相应哈密顿量序列的范数预解式意义上的极限。给出了所有哈密顿量的基态能量的满意界。

英文摘要:

In this note we consider a quantum mechanical particle moving inside an infinitesimally thin layer constrained by a parabolic well in the $x$-direction and, moreover, in the presence of an impurity modelled by an attractive Gaussian potential. We investigate the Birman-Schwinger operator associated to a model assuming the presence of a Gaussian impurity inside the layer and prove that such an integral operator is Hilbert-Schmidt, which allows the use of the modified Fredholm determinant in order to compute the bound states created by the impurity. Furthermore, we consider the case where the Gaussian potential degenerates to a $δ$-potential in the $x$-direction and a Gaussian potential in the $y$-direction. We construct the corresponding self-adjoint Hamiltonian and prove that it is the limit in the norm resolvent sense of a sequence of corresponding Hamiltonians with suitably scaled Gaussian potentials. Satisfactory bounds on the ground state energies of all Hamiltonians involved are exhibited.

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