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xinweigood: 金币+20, ★★★★★最佳答案 2014-09-16 05:22:06
Influence of magnetic field and lo phonon effects on the spin polarization state energy of strong-coupling bipolaron in a quantum dot
Eerdunchaolu1; Han, Chao1; Xin, Wei1 Email author firstname.lastname@example.org; Wuyunqimuge2
1Institute of Condensed Matter Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
2College of Physics and Electronic Information, Inner Mongolia University for Nationalities, Tongliao 028043, China
Xin, W. (email@example.com)
Journal of Low Temperature Physics
Abbreviated source title:
J. Low Temp. Phys.
Journal article (JA)
Springer New York, 233 Spring Street, New York, NY 10013-1578, United States
On the basis of Lee-Low-Pines unitary transformation, the influence of magnetic field and LO phonon effects on the energy of spin polarization states of strong-coupling bipolarons in a quantum dot (QD) is studied by using the variational method of Pekar type. The variations of the ground state energy E0 and the first excited state the energy E 1 of bipolarons in a two-dimensional QD with the confinement strength of QDs ω 0, dielectric constant ratio η, electron-phonon coupling strength α and cyclotron resonance frequency of the magnetic field ωc are derived when the influence of the spin and external magnetic field is taken into account. The results show that both energies of the ground and first excited states (E 0 and E1) consist of four parts: the single-particle energy of electrons Ee, Coulomb interaction energy between two electrons Ec, interaction energy between the electron spin and magnetic field ES and interaction energy between the electron and phonon E e - ph; the energy level of the first excited state E1 splits into two lines as E 1 (1 + 1) and E 1 (1 - 1) due to the interaction between the single-particle "orbital" motion and magnetic field, and each energy level of the ground and first excited states splits into three "fine structures" caused by the interaction between the electron spin and magnetic field; the value of E e - ph is always less than zero and its absolute value increases with increasing ω 0, α and ωc; the effect of the interaction between the electron and phonon is favorable to forming the binding bipolaron, but the existence of the confinement potential and Coulomb repulsive energy between electrons goes against that; the bipolaron with energy E 1 (1 - 1) is easier and more stable in the binding state than that with E 1 (1 + 1). © 2013 Springer Science+Business Media New York.
Number of references:
Electron-phonon interactions - Electrons - Excited states - Magnetic fields - Magnetic moments - Semiconductor quantum dots - Spin dynamics - Spin polarization
Bipolaron - Coulomb interaction energy - Cyclotron resonance frequencies - Electron-phonon coupling strengths - Influence of magnetic field - LO phonons - Polarization state - Quantum dot
933 Solid State Physics - 932.1 High Energy Physics - 931.3 Atomic and Molecular Physics - 801.4 Physical Chemistry - 714.2 Semiconductor Devices and Integrated Circuits - 701.2 Magnetism: Basic Concepts and Phenomena - 701.1 Electricity: Basic Concepts and Phenomena
Compilation and indexing terms, © 2013 Elsevier Inc.