SEMICONDUCTOR PHYSICS

Electric and magnetic optical polaron in quantum dot——Part 1: strong coupling

A. J. Fotue1, N. Issofa1, M. Tiotsop1, S. C. Kenfack1, M. P. Tabue Djemmo1, 3, H. Fotsin2 and L. C. Fai1

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 Corresponding author: A. J. Fotue, E-mail: A. J. Fotue: fotuea@yahoo.fr

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Abstract: We investigated the influence of electric field and magnetic field on the ground state energy of polaron in spherical semiconductor quantum dot (QD) using a modified Lee Low Pines (LLP) method. The numerical results show the increase of the ground state energy with the increase of the electric field and the decreasing with the magnetic field. The modulation of the electric field, magnetic field and the confinement lengths lead to the control of the decoherence of the system.

Key words: electric fieldmagnetic fieldmodified LLPpolaron energyquantum dot



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Fig. 1.  Ground state energy $\varepsilon _{\rm g}$ as a function of cyclotron frequency $\omega _{\rm c}$ (a) for $l_2$ $=$ 0.35 and $l_2$ $=$ 0.75 and fixed $\alpha$ $=$ 6.5 and $l_1$ $=$ 0.25,$E=2.5$ and (b) for $l_2 =$ 0.35 and $l_2 =$ 0.75 and fixed $\alpha =$ 6.5 and $l_1 =$ 0.25,$E=$ 10.

Fig. 2.  Ground state energy $\varepsilon _{\rm g}$ as a function of electric field $E$ (a) for $l_2 =$ 0.35 and $l_2 =$ 0.75 and fixed $\alpha =$ 6.5 and $l_1 =$ 0.25, $\omega _{\rm c} =$ 0.5 and (b) for $l_2 =$ 0.35 and $l_2 =$ 0.75 and fixed $\alpha =$ 6.5 and $l_1 =$ 0.25, $\omega _{\rm c} =$ 2.5.

Fig. 3.  Ground state energy $\varepsilon _{\rm g}$ as a function of electron--phonon coupling strength $\alpha $ (a) for $\omega _{\rm c} =$ 0.5 and $\omega _{\rm c} =$ 3.5 and fixed $E=$ 0.5, $l_1 =$ 0.55, $l_2 =$ 0.25 and (b) for $E=$ 1.0 and $E=$ 2.5 and fixed $\omega _{\rm c} =$ 1.0, $l_1 =$ 0.55, $l_2 =$ 0.25.

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    Received: 10 March 2015 Revised: Online: Published: 01 July 2015

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      A. J. Fotue, N. Issofa, M. Tiotsop, S. C. Kenfack, M. P. Tabue Djemmo, H. Fotsin, L. C. Fai. Electric and magnetic optical polaron in quantum dot——Part 1: strong coupling[J]. Journal of Semiconductors, 2015, 36(7): 072001. doi: 10.1088/1674-4926/36/7/072001 A. J. Fotue, N. Issofa, M. Tiotsop, S. C. Kenfack, M. P. T. Djemmo, H. Fotsin, L. C. Fai. Electric and magnetic optical polaron in quantum dot——Part 1: strong coupling[J]. J. Semicond., 2015, 36(7): 072001. doi:  10.1088/1674-4926/36/7/072001.Export: BibTex EndNote
      Citation:
      A. J. Fotue, N. Issofa, M. Tiotsop, S. C. Kenfack, M. P. Tabue Djemmo, H. Fotsin, L. C. Fai. Electric and magnetic optical polaron in quantum dot——Part 1: strong coupling[J]. Journal of Semiconductors, 2015, 36(7): 072001. doi: 10.1088/1674-4926/36/7/072001

      A. J. Fotue, N. Issofa, M. Tiotsop, S. C. Kenfack, M. P. T. Djemmo, H. Fotsin, L. C. Fai. Electric and magnetic optical polaron in quantum dot——Part 1: strong coupling[J]. J. Semicond., 2015, 36(7): 072001. doi:  10.1088/1674-4926/36/7/072001.
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      Electric and magnetic optical polaron in quantum dot——Part 1: strong coupling

      doi: 10.1088/1674-4926/36/7/072001
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      • Corresponding author: E-mail: A. J. Fotue: fotuea@yahoo.fr
      • Received Date: 2015-03-10
      • Accepted Date: 2015-04-23
      • Published Date: 2015-01-25

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