Magneto-photoluminescence of charged excitons from MgxZn1−xO/ZnO heterojunctions

作     者：T. Makino Y. Segawa A. Tsukazaki H. Saito S. Takeyama S. Akasaka K. Nakahara M. Kawasaki 

作者机构：Correlated Electron Research Group (CERG) and Cross-Correlated Materials Research Group (CMRG) RIKEN–Advanced Science Institute Wako 351-0198 Japan Department of Advanced Material Science University of Tokyo Kashiwa 277-8561 Japan PRESTO Japan Science and Technology Agency Tokyo 102-0075 Japan Institute for Solid State Physics University of Tokyo Kashiwa 277-8581 Japan R&D Headquarters ROHM Co. Ltd. Kyoto 615-8585 Japan Department of Applied Physics and Quantum-Phase Electronics Center (QPEC) University of Tokyo Tokyo 113-8656 Japan 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2013年第87卷第8期

页      面：085312-085312页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Japan Society for the Promotion of Science  JSPS  (23686008  24226002) 

主　　题：PHOTOLUMINESCENCE RESEARCH MAGNETIC fields MOLECULAR beam epitaxy ELECTRON gas research QUANTUM dots EXCITON theory 

摘      要：We report on the photoluminescence (PL) properties of MgxZn1−xO/ZnO heterojunctions grown by plasma-assisted molecular-beam epitaxy. Influence of the applied magnetic field (B) on the radiative recombination of the two-dimensional electron gas (2DEG) is investigated up to 54 T. An increase in magnetic field in the range of B ≤ 20 T results in a redshift in the PL. Abrupt lineshape changes in the PL spectra are observed at higher magnetic fields, in correlation with the integer quantum Hall states. We attempt to interpret these features using the conventional model for the 2DEG-related PL based on the transition between the 2DEG and a hole as well as a model taking a bound state effect into account, i.e., a charged exciton. The comparison about the adequateness of these models was made, being in favor of the charged exciton model.