Open AccessOptical property of modulated n-doped ZnSe/BeTe type-Ⅱ quantum wells
Author(s) -
Ziwu Ji,
H. Mino,
Kojima Eiji,
R. Akimoto,
S. Takeyama
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.3260
Subject(s) - quantum well , exciton , doping , condensed matter physics , electric field , materials science , quantum confined stark effect , stark effect , electron , cyclotron resonance , atomic physics , physics , optics , cyclotron , laser , quantum mechanics
We report the optical properties of the modulated n-doped ZnSe/BeTe/ZnSe type-Ⅱ quantum wells. The reflection spectra have shown typical negatively charged exciton features only in a doped sample. The luminescence spectra and the polarization anisotropy depend strikingly on both the n-doping into the barrier layers and an applied external electric field perpendicular to the layer. These are explained by screening of the built-in electric field with n-doping and Stark effects due to the applied electric field. The electron density as well as the mass was determined in high magnetic field (up to 160 T) cyclotron-resonance measurements. It was found that the observed indirect PL transition occurs via the charged excitons in a type-II quantum configuration.