CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Built-in electric field effect on cyclotron mass of magnetopolarons in a wurtzite InxGa1-xN/GaN quantum well |
Zhao Feng-Qi (赵凤岐), Yong Mei (咏梅) |
a College of Physics and Electronic Information, Inner Mongolia Normal University, Inner Mongolia KeyLaboratory for Physics and Chemistry of Functional Materials, Hohhot 010022, China; b Division of Science and Technology, Inner Mongolia Normal University, Hohhot 010022, China |
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Abstract The cyclotron mass of magnetopolarons in wurtzite InxGa1-xN/GaN quantum well is studied in the presence of an external magnetic field by using the Larsen perturbation method. The effects of the built-in electric field and different phonon modes including interface, confined and half-space phonon modes are considered in our calculation. The results for a zinc-blende quantum well are also given for comparison. It is found that the main contribution to the transition energy comes from half-space and interface phonon modes when the well width is very small while the confined modes play a more important role in a wider well due to the location of the electron wave function. As the well width increases, the cyclotron mass of magnetopolarons first increases to a maximum and then decreases either with or without the built-in electric field in the wurtzite structure and the built-in electric field slightly reduces the cyclotron mass. The variation of cyclotron mass in a zinc-blende structure is similar to that in a wurtzite structure. With the increase of external magnetic field, the cyclotron mass of polarons almost linearly increases. The cyclotron frequency of magnetopolarons is also discussed.
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Received: 02 February 2012
Revised: 02 April 2012
Accepted manuscript online:
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PACS:
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71.38.-k
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(Polarons and electron-phonon interactions)
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63.20.kr
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73.21.Fg
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(Quantum wells)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10964007) and the Natural Science Foundation of Inner Mongolia, China (Grant No. 2009MS0110). |
Corresponding Authors:
Zhao Feng-Qi
E-mail: fqzhao@imnu.edu.cn
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Cite this article:
Zhao Feng-Qi (赵凤岐), Yong Mei (咏梅) Built-in electric field effect on cyclotron mass of magnetopolarons in a wurtzite InxGa1-xN/GaN quantum well 2012 Chin. Phys. B 21 107103
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