Spin 1/2 Particle on a Cylinder with Radial Magnetic Field

Details Spin 1/2 Particle on a Cylinder with Radial Magnetic Field Spin 1/2 Particle on a Cylinder with Radial Magnetic Field

2002-12-09

arxiv.org/abs/quant-ph/0212054v2

Physics

Quantum Physics

11 pages, 4 figures. v2: changes in the introduction, added section with conclusions and references

Scientific paper

We study the motion of a charged quantum particle, constrained on the surface of a cylinder, in the presence of a radial magnetic field. When the spin of the particle is neglected, the system essentially reduces to an infinite family of simple harmonic oscillators, equally spaced along the axis of the cylinder. Interestingly enough, it can be used as a quantum Fourier transformer, with convenient visual output. When the spin 1/2 of the particle is taken into account, a non-conventional perturbative analysis results in a recursive closed form for the corrections to the energy and the wavefunction, for all eigenstates, to all orders in the magnetic moment of the particle. A simple two-state system is also presented, the time evolution of which involves an approximate precession of the spin perpendicularly to the magnetic field. A number of plots highlight the findings while several three-dimensional animations have been made available on the web.

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