Properties of Spin Polarization State of Two-Electron System on Two-Dimensional Quantum Dots with Magnetic Field
Year: 2014
Author: Wuyunqimuge, Wei Xin, Chao Han, Eerdunchaolu
Journal of Atomic and Molecular Sciences, Vol. 5 (2014), Iss. 2 : pp. 100–109
Abstract
Influence of the magnetic field on the energy of the spin polarization state of a two-electron system in two-dimensional quantum dots (QDs) is studied by using the method of few-body physics. As example, a numerical calculation is performed for a GaAs semiconductor QD to show the variations of the ground-state energy E0, the spin-singlet energy E1(A) and spin-triplet energy E1(S) of the first excited state and the energy difference (i.e. ΔE(A) and ΔE(S)) between the first excited and ground states with the effective radius R0 of the QD and the magnetic field B. The results show that E0 increases with increasing B, but decreases with increasing R0; in the magnetic field, the spin-singlet energy E1(A) of the first excited state splits into two levels as E1+1(A) and E1−1(A), the spin-triplet energy E1(S) of the first excited state splits into two sets as E1+1(S) and E1−1(S), and each set consists of three "fine structures" which correspond to MS=1,0,−1, respectively; each energy level (set, energy difference) decreases with increasing R0, but there are great differences among the changes of them with B: E1+1(A), EMS1+1(S), ΔE1+1(A), and ΔEMS1+1(S) increase significantly with increasing B, but the variations of E1−1(A), EMS1−1(S), ΔE1−1(A), and ΔEMS1−1(S) with B are relatively slow; the splitting degree of each energy level (set, energy difference) is proportional to the first power of the magnetic field B.
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Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/jams.090313.120113a
Journal of Atomic and Molecular Sciences, Vol. 5 (2014), Iss. 2 : pp. 100–109
Published online: 2014-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 10
Keywords: quantum dot method of few-body physics electron-electron interaction spin polarization state.