Influence of Magnetic Field and Coulomb Field on the Properties of the Internal Excited State of Weak-coupling Bound Magnetopolaron in Parabolic Quantum Dot
GE Li-rong, XIAO Jing-lin. Influence of Magnetic Field and Coulomb Field on the Properties of the Internal Excited State of Weak-coupling Bound Magnetopolaron in Parabolic Quantum Dot[J]. Chinese Journal of Luminescence, 2007,28(6): 832-836
GE Li-rong, XIAO Jing-lin. Influence of Magnetic Field and Coulomb Field on the Properties of the Internal Excited State of Weak-coupling Bound Magnetopolaron in Parabolic Quantum Dot[J]. Chinese Journal of Luminescence, 2007,28(6): 832-836DOI:
With the development of several experimental techniques
for example
metalorgnic chemical vapour deposition
molecular beam epitaxy and electron beam lithography combined with reverse mesa etching
there has been of considerable interest in understanding of hydrogenic-impurity states in low-dimensional semiconductor heterostructures such as quantum wells
quantum wires
and quantum dots.In recent years
there is of great interest in investigating quantum dots both theoretically and experimentally.Due to the small structures of QDs
some physical properties such as optical and electron transport characteristic are quite different from those of the bulk materials.The study on the impurity states in these low dimensional structures is an important aspect on which many theoretical and experimental works based.Recently there has been a considerable number of theoretical studies on the effect of a bound magnetopo-laron in a parabolic quantum dot.However
there has very few article on the properties of the internal excited state of bound magnetopolaron by using the linear combination operator in parabolic quantum dot up to date.In this paper
by using the linear combination operator and the unitary transformation method
the properties of the excited state of the weak-coupling bound magnetopolaron in a parabolic quantum dot were calculated.The relation of the vibrational frequency
the first internal excited state energy
the excitation energy and the resonance frequency of the weak-coupling bound magnetopolaron with the effective confinement length of the quantum dot
the Coulomb bound potential
the electron-LO-phonon coupling strength and the cyclotron frequency in a parabolic quantum dot were obtained.Results show that he vibrational frequency
the first internal excited state energy
the excitation energy and the resonance frequency of the bound magnetopolaron increase rapidly with decreasing the effective confinement length in the electron-phonon weak-coupling case in a parabolic quantum dot.They also increase with increasing the Coulomb bound potential and decreasing the electron-phonon coupling strength.