CAJ | 학술논문

考虑激子与体纵光学声子的相互作用,采用变分法研究了量子点量子阱结构中澈子的极化效应.以CdS/HgS量子点量子阱结构为例进行数值计算,得到了激子的基态能量和束缚能.研究结果表明,声子对澈子束缚能的贡献随着阱宽的增加而增加,极化子效应不能忽略.激子的基态能量和束缚能明显依赖于量子点量子阱结构的核半径和壳层厚度,量子点量子阱结构的尺寸对激子-声子相互作用有重要的影响.
고필격자여체종광학성자적상호작용,채용변분법연구료양자점양자정결구중철자적겁화효응.이CdS/HgS양자점양자정결구위례진행수치계산,득도료격자적기태능량화속박능.연구결과표명,성자대철자속박능적공헌수착정관적증가이증가,겁화자효응불능홀략.격자적기태능량화속박능명현의뢰우양자점양자정결구적핵반경화각층후도,양자점양자정결구적척촌대격자-성자상호작용유중요적영향.
The polaronic effect on the exciton in a spherical quantum dot quantum well (QDQW) structure is studied theoretically by using a variational approach.The interactions of an exciton with the longitudinal optical phonons are taken into account in the framework of the dielectric continuum approximation.The calculations are carried out for a CdS/HgS quantum dot quantum well structure.It is shown that the contribution of the phonons to the binding energy increases when the well width increases and the polaron effects are un-negligible.Both the ground state energy and the binding energy of exciton depends sensitively on the core radius and shell thickness of the QDQW structure.