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arXiv quant-ph/0003086quant-phhep-thmath-phmath.MP
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库仑场和磁场中的平面Dirac电子

Planar Dirac Electron in Coulomb and Magnetic Fields

Choon-Lin Ho, V. R. Khalilov

摘要:

本文讨论了二维电子在库仑磁场和均匀磁场中的狄拉克方程。对于弱磁场,用半经典方法得到了近似的能量值。在强磁场的情况下,我们给出了确定波函数级数展开系数、可能能量和磁场的精确递推关系。结果表明,对于一个无穷大的磁场强度集合,解析解是可能的。因此,该系统是所谓的准精确可解模型的一个例子。狄拉克情形的一个显著特点是,取决于库仑场的强度,并非所有的总角动量量子数都能用合理的多项式形式的波函数得到精确解。利用因式分解的方法,讨论了库仑场既有吸引力又有排斥力的非相对论极限解。

英文摘要:

The Dirac equation for an electron in two spatial dimensions in the Coulomb and homogeneous magnetic fields is discussed. For weak magnetic fields, the approximate energy values are obtained by semiclassical method. In the case with strong magnetic fields, we present the exact recursion relations that determine the coefficients of the series expansion of wave functions, the possible energies and the magnetic fields. It is found that analytic solutions are possible for a denumerably infinite set of magnetic field strengths. This system thus furnishes an example of the so-called quasi-exactly solvable models. A distinctive feature in the Dirac case is that, depending on the strength of the Coulomb field, not all total angular momentum quantum number allow exact solutions with wavefunctions in reasonable polynomial forms. Solutions in the nonrelativistic limit with both attractive and repulsive Coulomb fields are briefly discussed by means of the method of factorization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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