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本文采用六带K·P理论计算了耦合量子点在不同耦合距离下空穴基态特性,探讨了轻重空穴及轨道自旋相互作用对耦合量子点空穴基态反成键态特性的影响.在考虑多带耦合的情况下,耦合量子点随着耦合强度的变化,价带基态能级和激发态能级发生反交叉现象.同时,随着耦合距离的增加,量子点基态轻重空穴波函数的比重发生变化,导致量子点空穴基态波函数从成键态反转成为反成键态.同时研究发现,因空穴基态及激发态波函数特性的转变,电子、空穴的基态及激发态波函数的叠加强度发生的明显变化.
In this paper, the six-band K · P theory is used to calculate the ground state properties of the coupled quantum dots at different coupling distances and the effect of the interaction of light-heavy holes and orbital on the ground-state inverse bonding state of coupled quantum dots Considering the multi-band coupling, the coupling of quantum dots with the coupling strength, the valance band ground state and excited state level anti-cross phenomenon occurs.At the same time, as the coupling distance increases, the quantum dot ground state light and heavy hole wave function , Which leads to the inversion of the ground state wave function of the quantum dot cavity from the bonding state to the anti-bonding state.At the same time, it is found that due to the change of the ground state and the wave function of the excited state, the ground state and the excitation of electrons and holes Significant changes in the superposition intensities of the state wave functions occur.