Al_(x)Ga_(1-x)/GaN heterostructures are investigated by magnetotransport experiments in tilted magnetic fields at low temperatures.The spin-split peaks of the Shubnikov-de Haas(SdH)oscillations are observed at high ma...Al_(x)Ga_(1-x)/GaN heterostructures are investigated by magnetotransport experiments in tilted magnetic fields at low temperatures.The spin-split peaks of the Shubnikov-de Haas(SdH)oscillations are observed at high magnetic fields,which are attributed to the Zeeman spin-splitting of the two-dimensional electron gas at the heterointerface.The exchange enhanced g*of the spin-splitting is investigated by measuring the positions of the pairs of spin-split SdH maxima.Moreover,it is found that g^(*)becomes smaller with the increasing tilt angle,which suggests the anisotropy of g^(*)is due to the strong polarization-induced electric field at the Al_(x)Ga_(1-x)N/GaN heterointerface.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 National Natural Science Foundation of China under Grant Nos 60806042,10774001 and 60890193the Research Fund for the Doctoral Program of Higher Education in China(200800011021).
文摘Al_(x)Ga_(1-x)/GaN heterostructures are investigated by magnetotransport experiments in tilted magnetic fields at low temperatures.The spin-split peaks of the Shubnikov-de Haas(SdH)oscillations are observed at high magnetic fields,which are attributed to the Zeeman spin-splitting of the two-dimensional electron gas at the heterointerface.The exchange enhanced g*of the spin-splitting is investigated by measuring the positions of the pairs of spin-split SdH maxima.Moreover,it is found that g^(*)becomes smaller with the increasing tilt angle,which suggests the anisotropy of g^(*)is due to the strong polarization-induced electric field at the Al_(x)Ga_(1-x)N/GaN heterointerface.
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.
