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Zeitschrift für Physik B Condensed Matter

, Volume 104, Issue 2, pp 227–234 | Cite as

Energy of a bound polaron in a magnetic field in asymmetric polar semiconductor heterostructures

  • Zhi-jie WangEmail author
  • Yong-gang Weng
  • Jun-jie Shi
  • Zi-xin Liu
  • Shao-hua Pan
Article

Abstract

In this paper, a new modified Hamiltonian of a polaron bound to a donor impurity in asymmetric step quantum wells (QWs) in the presence of an arbitrary magnetic field is given, in which the coupling of an electron with confined bulk-like LO phonons, half-space LO phonons and interface phonon modes is included. Especially, the interaction of the impurity with all possible optical-phonon modes is also considered. The ionization energy of a bound polaron in a magnetic field for asymmetric step QWs are studied by using a modified Lee-Low-Pines (LLP) variational method. The effects of the finite electronic confinement potential and the subband nonparabolicity are also considered. The relative importance of the donor impurity located at the well and the step is analyzed. Our results show the interaction between the impurity and the phonon field in screening the Coulomb interaction has a significant influence on the binding energy of bound polaron. The influence of subband non-parabolicity is appreciable on the bound polaron effects for the narrow well. The binding energy of bound polaron given in this paper are excellent agreement with the experimental measurement.

PACS

71.38.+i 63.20.Kr 

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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Zhi-jie Wang
    • 2
    Email author
  • Yong-gang Weng
    • 3
  • Jun-jie Shi
    • 1
    • 2
  • Zi-xin Liu
    • 2
  • Shao-hua Pan
    • 1
    • 4
  1. 1.CCAST (World Laboratory)BeijingPeople’s Republic of China
  2. 2.Department of PhysicsHenan Normal University, XinxiangHenanPeople’s Republic of China
  3. 3.Department of PhysicsZhengzhou University, ZhengzhouHenanPeople’s Republic of China
  4. 4.Institute of PhysicsAcademia SinicaBeijingPeople’s Republic of China

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