Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-05-22
J.Math.Phys. 43 (2002) 43-51
Physics
High Energy Physics
High Energy Physics - Theory
LaTex, 12 pages, no figures
Scientific paper
10.1063/1.1418426
The Dirac equation for an electron in two spatial dimensions in the Coulomb and homogeneous magnetic fields is an example of the so-called quasi-exactly solvable models. The solvable parts of its spectrum was previously solved from the recursion relations. In this work we present a purely algebraic solution based on the Bethe ansatz equations. It is realised that, unlike the corresponding problems in the Schr\"odinger and the Klein-Gordon case, here the unknown parameters to be solved for in the Bethe ansatz equations include not only the roots of wave function assumed, but also a parameter from the relevant operator. We also show that the quasi-exactly solvable differential equation does not belong to the classes based on the algebra $sl_2$.
Chiang Chun-Ming
Ho Choon-Lin
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