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用有效质量理论研究了δ掺杂势中电子和空穴的行为。发现能量接近于δ势垒峰的空穴穿越势垒时能产生一系列谐振态。这些状态中的空穴波函数汇聚在势垒峰周围而同量子限制在势阱中的电子波函数交叠,产生光跃迁。用MBE生长的δ掺杂样品进行光调制光谱测量,发现明显的带间跃迁峰。测得的光谱峰同理论计算的能级相吻合,证实了δ势垒中空穴的新行为。
The effective mass theory is used to study the behavior of electrons and holes in δ-doping potential. It is found that a series of resonant states can be generated when holes with energy close to the δ potential barrier cross the barrier. The hole-wave function in these states converges around the barrier peak and overlaps with the electron wavefunction whose quantum confines in the potential well, resulting in a light transition. Optical modulation spectroscopy was performed on the δ-doped samples grown with MBE and significant band-to-band transition peaks were found. The measured spectral peaks coincide with the theoretical calculated levels, confirming the new behavior of holes in the δ barrier.