Spin-orbit coupling in a gate-controlled In0.53 Ga0.47 As/InP quantum well is investigated in the presence of a large Zeeman effect. We develop a fourier-transform fitting procedure to extract the zero-field spin-spli...Spin-orbit coupling in a gate-controlled In0.53 Ga0.47 As/InP quantum well is investigated in the presence of a large Zeeman effect. We develop a fourier-transform fitting procedure to extract the zero-field spin-splitting Rashba parameter α. The bare 9 factor value is found to be of the order of 3 from magnetotransport measurements in tilted magnetic fields. It is found that both Zeeman splitting and Rashba splitting play important roles in determining the total spin splitting in In0.53Ga0.47 As.展开更多
Low-field magnetotransport properties of two-dimensional electron gases(2DEGs)are investigated in Al_(0.22)Ga_(0.78)N/GaN heterostructures.By means of a tilting magnetic field,unexpected oscillations of magnetoresisti...Low-field magnetotransport properties of two-dimensional electron gases(2DEGs)are investigated in Al_(0.22)Ga_(0.78)N/GaN heterostructures.By means of a tilting magnetic field,unexpected oscillations of magnetoresistivity are observed in a weak localization region.Qualitative understanding based on Altshuler–Aronov–Spivak oscillations is proposed for the case of interface disorder in Al_(0.22)Ga_(0.78)N/GaN heterostructures.展开更多
基金Supported by the Special Funds for Major State Basic Research Project under Grant No 2007CB924901, the National Natural Science Foundation of China under Grant No 60221502, the Knowledge Innovation Programme of Chinese Academy of Sciences under Grant No C2-12, and Science and Technology Commission of Shanghai under Grant No 07JC14059.
文摘Spin-orbit coupling in a gate-controlled In0.53 Ga0.47 As/InP quantum well is investigated in the presence of a large Zeeman effect. We develop a fourier-transform fitting procedure to extract the zero-field spin-splitting Rashba parameter α. The bare 9 factor value is found to be of the order of 3 from magnetotransport measurements in tilted magnetic fields. It is found that both Zeeman splitting and Rashba splitting play important roles in determining the total spin splitting in In0.53Ga0.47 As.
基金by the National Natural Science Foundation of China under Grant Nos 60806042,10774001 and 60990313the Research Fund for the Doctoral Program of Higher Education in China(200800011021)the Wuhan National High Magnetic Field Center(WHMFCKF2011004).
文摘Low-field magnetotransport properties of two-dimensional electron gases(2DEGs)are investigated in Al_(0.22)Ga_(0.78)N/GaN heterostructures.By means of a tilting magnetic field,unexpected oscillations of magnetoresistivity are observed in a weak localization region.Qualitative understanding based on Altshuler–Aronov–Spivak oscillations is proposed for the case of interface disorder in Al_(0.22)Ga_(0.78)N/GaN heterostructures.
