Properties of strong-coupling bipolaron qubit in parabolic potential quantum dot

被引：0
|
作者：
Eerdunchaolu [1 ]
Han C. [1 ]
Zhang Y. [1 ]
机构：
[1] Department of Physics, Hebei Normal University of Science & Technology, Qinhuangdao
来源：
Eerdunchaolu (eerdunchaolu@163.com) | 1600年 / Editorial Office of Chinese Optics卷 / 37期
关键词：
Bipolaron; Lee-Low-Pines-Pekar variational method; Quantum dot; Qubit;
D O I：
10.3788/fgxb20163702.0144
中图分类号：
学科分类号：
摘要：
On the basis of Lee-Low-Pines (LLP) unitary transformation, the eigenenergy and eigenfunction of the ground-state and the first excited state of the strong-coupling bipolaron in two-dimensional quantum dot (QD) were obtained by using the variational method of Pekar type. A qubit was formed by overlaying both the ground state and the first excited state of the bipolaron system. Numerical calculations indicate that the oscillating period T0 of qubits decreases with the increasing the electron-phonon coupling strength α, the confinement strength ω0 of the quantum dot, and the dielectric constant ratio η; the distribution of the probability density Q of the electrons in quantum dot oscillates periodically with time t, angle coordinate φ2, and the dielectric constant ratio η, and there is a maximum at near the center and zero away from the center of quantum dot. © 2016, Science Press. All right reserved.
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页码：144 / 150
页数：6
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共 18 条
  • [11] Chen Y.J., Xiao J.L., The temperature effects on the parabolic quantum dot qubit in the electric field, J. Low Temp. Phys., 170, 1-2, pp. 60-67, (2013)
  • [12] Sun Y., Ding Z.H., Xiao J.L., Effects of magnetic field on the coherence time of a parabolic quantum dot qubit, J. Low Temp. Phys., 177, 3-4, pp. 151-156, (2014)
  • [13] Eerdunchaolu, Xin W., Temperature dependence of the properties of strong-coupling bipolaron in a quantum dot, Phys. B, 406, 3, pp. 358-362, (2011)
  • [14] Xiao J.L., Properties of a strong coupling bipolaron in an asymmetric quantum dot, J. Low Temp. Phys., 174, 5-6, pp. 284-291, (2014)
  • [15] Zhao Y.W., Han C., Xin W., Et al., Spin polarization ground state of quasi-2D magneto-bipolarons in the strong-coupling limit, Superlattices Microstruct., 74, pp. 198-205, (2014)
  • [16] Lee T.D., Low F.E., Pines D., The motion of slow electrons in a polar crystal, Phys. Rev., 90, 2, pp. 297-302, (1953)
  • [17] Yildirim T., Ercelebi A., The grounds-state description of the optical polaron versus the effective dimensionality in quantum-well-type systems, J. Phys. Condens. Matter., 3, 10, pp. 1271-1277, (1991)
  • [18] Eerdunchaolu, Bai X.F., Han C., Properties of the internal excited state of the strong-coupling magneto-bipolaron in a parabolic quantum dot, Acta Phys. Sinica, 63, 2, (2014)
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