On the discreet spectrum of fractional quantum hydrogen atom in two dimensions

Abstract

We consider a fractional generalization of two-dimensional (2D) quantum-mechanical Kepler problem corresponding to 2D hydrogen atom. Our main finding is that the solution for discreet spectrum exists only for $\mu >1$ (more specifically $1<\mu \le 2$, where $\mu =2$ corresponds to "ordinary" 2D hydrogenic problem), where $\mu$ is the Lévy index. We show also that in fractional 2D hydrogen atom, the orbital momentum degeneracy is lifted so that its energy starts to depend not only on principal quantum number $n$ but also on orbital $m$. To solve the spectral problem, we pass to the momentum representation, where we apply the variational method. This permits to obtain approximate analytical expressions for eigenvalues and eigenfunctions with very good accuracy. Latter fact has been checked by numerical solution of the problem. We also found the new integral representation (in terms of complete elliptic integrals) of Schrödinger equation for fractional hydrogen atom in momentum space. We point to the realistic physical systems like bulk semiconductors as well as their heterostructures, where obtained results can be used.

10 pages, 3 figures

References in corpus (6)

• Fractional Quantum Mechanics
• Scaling laws of Rydberg excitons
• Energy levels of a two-dimensional hydrogen atom with spin-orbit Rashba interaction
• Energy levels repulsion by spin-orbit coupling in two-dimensional Rydberg excitons
• Lévy flights confinement in a parabolic potential and fractional quantum oscillator
• Chaos in two-dimensional Kepler problem with spin-orbit coupling