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Optical properties of exciton and charged exciton in undoped ZnSe/BeTe type-Ⅱ quantum wells under high magnetic fields

Ji Zi-Wu Zheng Yu-Jun Xu Xian-Gang

Optical properties of exciton and charged exciton in undoped ZnSe/BeTe type-Ⅱ quantum wells under high magnetic fields

Ji Zi-Wu, Zheng Yu-Jun, Xu Xian-Gang
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  • Received Date:  14 November 2009
  • Accepted Date:  25 July 2010
  • Published Online:  15 April 2011

Optical properties of exciton and charged exciton in undoped ZnSe/BeTe type-Ⅱ quantum wells under high magnetic fields

  • 1. (1)School of Physics, Shandong University, Jinan 250100, China; (2)State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

Abstract: We report on the magnetic field (up to 53 T) dependence of photoluminescence (PL) spectra occurring as a spacially direct optical transition of the ZnSe layer in undoped ZnSe/BeTe/ZnSe type-II quantum structures at a low temperature (4.2 K). With magnetic field increasing, the PL intensity (IX) of exciton (X) shows an oscillation feature opposite to the PL intensity (IX-) of charged exciton (X-). As IX- increases, IX decreases, but as IX- decreases, IX increases. In all fields, the oscillation behaviour shows a periodic change approximately with magnetic field interval. The results are attributed to the periodic resonance of the Fermi level with the Landau level, which results in the modulation of the density of states of the 2DEG system at the Fermi energy.

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