表面超晶格在电场下的子带结构和带间光跃迁

本文着重研究了表面超晶格，即二维调制电子气在外加电场下的子能带结构．计算结果表明，对于本文研究的一种特殊构型的表面超晶格，由外加调制结构引起的子能带带隙，态密度和与子能带带间光跃迁相联系的光学吸收峰都会随着电场的变化而发生显著的变化．

Subband Structures and Intersubband Optical Transition in Lateral Surface Superlattices Under Electric Fields

Subband structures of two-dimensional electronic gases modulated by lateral periodic potentials arising from periodically structured interfaces, such as those produced by the deposition of AlAs GaAs fractional layers on (001) vicinal GaAs substrates under normally applied electric fields, are studied by variational numerical calculations. The results show that minigaps of electronic subbands, the density of states and the optical absorption peaks with electronic transtions of the systems depend sensitively on teh electric fields.