The two-dimensional hydrogen atom revisited

Details The two-dimensional hydrogen atom revisited The two-dimensional hydrogen atom revisited

2002-05-21

arxiv.org/abs/math-ph/0205031v1

Journal of Mathematical Physics 43, 4681 (2002)

Physics

Mathematical Physics

10 pages, no figures, RevTex4

Scientific paper

10.1063/1.1503868

The bound state energy eigenvalues for the two-dimensional Kepler problem are found to be degenerate. This "accidental" degeneracy is due to the existence of a two-dimensional analogue of the quantum-mechanical Runge-Lenz vector. Reformulating the problem in momentum space leads to an integral form of the Schroedinger equation. This equation is solved by projecting the two-dimensional momentum space onto the surface of a three-dimensional sphere. The eigenfunctions are then expanded in terms of spherical harmonics, and this leads to an integral relation in terms of special functions which has not previously been tabulated. The dynamical symmetry of the problem is also considered, and it is shown that the two components of the Runge-Lenz vector in real space correspond to the generators of infinitesimal rotations about the respective coordinate axes in momentum space.

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