【摘要】 我们采用顾世洧研究体内激子的方法,讨论了极性晶体表面激子在法向恒定弱磁场中的性质。计及晶格振动表面模的影响,对慢激子导出了表面激子的自能、有效作用势,以及重整化质量。我们发现激子的自能不仅与电子、空穴质量比有关,而且与磁场强度有关,磁场的作用使激子的自能变大。更多还原

【Abstract】 The properties of an exciton at the surface of a polar cryrstal in a weak magnetic field B, which is perpendicular to the surface and is constant, are discussed by a perturbational method with which Shi-wei Gu studied the problems of excitons. Taking account of the effects from the surface modes of the lattice vibrations and on ground of a slow motion of the excitons, the selfenergy of an exciton, the effective potential and renormalized masses are derived. We find that the self-energy of the exciton is related not only to the electron-hole ratio, but also to the magnetic field intensity. The self-energy of the exciton becomes higher under the action of the magnetic field.更多还原