The Landau electron problem on a cylinder

Details The Landau electron problem on a cylinder The Landau electron problem on a cylinder

2003-05-20

arxiv.org/abs/math-ph/0305041v2

Ann. Phys. 309 (2004), 421-441

Physics

Mathematical Physics

26 pages, revtex file, no figures. In version 2, introduction is expanded to explain our approach and references are updated.

Scientific paper

We consider the quantum mechanics of an electron confined to move on an infinite cylinder in the presence of a uniform radial magnetic field. This problem is in certain ways very similar to the corresponding problem on the infinite plane. Unlike the plane however, the group of symmetries of the magnetic field, namely, rotations about the axis and the axial translations, is {\em not} realized by the quantum electron but only a subgroup comprising rotations and discrete translations along the axial direction, is. The basic step size of discrete translations is such that the flux through the `unit cylinder cell' is quantized in units of the flux quantum. The result is derived in two different ways: using the condition of projective realization of symmetry groups and using the more familiar approach of determining the symmetries of a given Hamiltonian.

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