物理学报Issue(2)：027501-1-027501-8,8.DOI:10.7498/aps.63.027501
抛物量子点中强耦合磁双极化子内部激发态性质
Prop erties of the internal excited state of the strong-coupling magneto-bip olaron in a parab olic quantum dot
摘要
Abstract
The properties of the internal excited state of the strong coupling magneto-bipolarons in a parabolic quantum dot are studied by using the variational method of Pekar type based on the Lee-Low-Pines’ unitary transformation. With the influences of the electronic spin and the external magnetic field taken into consideration, the change law of ground state energy E0, the average number of phonon ¯N0, the first excited state energy E1 and the average number of phonon ¯N1 of the magneto-bipolarons with the confinement strength ω0, the dielectric constant ratio η, the electron-phonon couplingα, and the cyclotron frequencyωc are derived in two-dimensional quantum dot. Numerical results indicate that the ground state energy E0 and the first excited state energy E1 consist of four parts: the single-article energy Ee of two electrons, the Coulomb interaction energy EC between two electrons, the interaction energy Es between the electronic spin and the external magnetic field, and the interaction energy Ee-ph of the electron with the longitudinalo optical phonons. The energy E1 of the first excited state splits into two lines, i.e., E (1+1)1 and E (1-1)1 due to the interaction between the“orbital”motion of the single-particle and the magnetic field, and each level of the ground-state energy and the first excited state energies set produces three “fine structures” due to the interaction between the electronic spin and the magnetic field. ¯N0 and ¯N1 increase with ω0 , α and ωc increasing; E e-ph is always less than zero, and absolute value|E e-ph|increases withω0,αandωc increasing. The electron-phonon interaction has an important influence on the formation of bound state of the magneto-bipolaron;but the confinement potential and coulomb repulsive energy between electrons are unfavorable for the formation of magneto-bipolaron in the bound state.关键词
量子点/磁双极化子/内部激发态Key words
quantum dot/magneto-bipolaron/internal excited state引用本文复制引用
额尔敦朝鲁,白旭芳,韩超..抛物量子点中强耦合磁双极化子内部激发态性质[J].物理学报,2014,(2):027501-1-027501-8,8.基金项目
河北省自然科学基金(批准号：E2013407119)和河北省高等学校科学技术研究重点项目(批准号：ZD20131008)资助的课题.@@@@ Project supported by the National Natural Science Foundation of Hebei Province, China (Grand No. E2013407119) and the Items of Institution of Higher Education Scientific Research of Hebei Province, China (Grand No. ZD20131008) （批准号：E2013407119）
