International Journal of Theoretical Physics

, Volume 54, Issue 9, pp 3268–3277 | Cite as

Influence of Magnetic Field and LO Phonon Effect on Properties of Magnetopolarons and Qubit in Quantum Disks

  • Chao Han
  • Wei Xin
  • Ying Zhang
  • Eerdunchaolu


Influence of external magnetic field, longitudinal-optical (LO) phonon effect and thickness of quantum disks (QDs) on the properties of electron-LO phonon strong-coupling magnetopolarons and the qubit is studied by using Lee -Low-Pines-Huybrechts variational method. The expressions for the mean number of phonons of magnetopolarons \(\bar {N}\), electron-LO phonon interaction energy E e−ph, energies of the ground and first-excited states E 0 and E 1, oscillation period T 0 of qubits and probability distribution ρ of electrons are derived. Results of numerical calculations show that the mean number of phonons of the ground state of magnetopolarons is larger than that of the first-excited state, the mean number of phonons of magnetopolarons \(\bar {N}\) increases with increasing the cyclotron frequency ω c, confinement strength ω 0 and coupling strength α, but decreases and oscillates with increasing the thickness of QDs L; E e−ph is always negative, ∣E e-ph∣ of the ground state is larger than that of the first-excited state, and ∣E e-ph∣ increases with increasing ω c, ω 0 and α but decreases with increasing L; E 0 and E 1 increase with increasing ω c, ω 0 and α, but decrease with increasing L; T 0 increases with increasing ω 0 and L, but decreases with increasing α; ρ decreases and oscillates with increasing L, and decreases with increasing ω 0; the variations of T 0 and ρ with ω c and L are influenced by ω 0 and α significantly.


Quantum disk Magnetopolaron Qubit Lee-Low-Pines-Huybrechts variational method 



This work is supported by National Nature Science Foundation of Hebei Province, China (E2013407119) and the Items of Institution of Higher Education Scientific Research of Hebei Province, China (ZD20131008).


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of PhysicsHebei Normal University of Science & TechnologyQinhuangdaoChina

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