The temperature dependence of internal friction （ T- tan φ curves） in pure aluminium （Al） is measured at sixteen different frequencies. Based on T- tan φ curves, the frequency dependence of internal friction （f...The temperature dependence of internal friction （ T- tan φ curves） in pure aluminium （Al） is measured at sixteen different frequencies. Based on T- tan φ curves, the frequency dependence of internal friction （f -tan φ curves） is also obtained by the interpolation method. An internal friction peak is observed in both the T - tan φ curves and the f - tan φ curves. The activation energy of the peak in the f - tan φ curves is found to be 2.08 ± 0.02 eV and compared to the value of 1.60 ± 0.04 eV in the T - tan φ curves. It is suggested that the change of relaxation strength with temperature should be considered when one calculates the activation energy of the peak in T- tan φ curves.展开更多
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
基金Supported by the National Key R&D Program of China(2018YFB0406500,2019YFB2203400)the Natural Science Foundation of Chi⁃na(91833303,61974043,61674057)Projects of Science and Technology Commission of Shanghai Municipality(18JC1412400,18YF1407200,18YF1407000,19511120100).
基金Supported by the National Natural Science Foundation of China Grant Nos 10171067 and 10374089, and the Foundation of the Institute of Solid State Physics, Chinese Academy of Sciences.
文摘The temperature dependence of internal friction （ T- tan φ curves） in pure aluminium （Al） is measured at sixteen different frequencies. Based on T- tan φ curves, the frequency dependence of internal friction （f -tan φ curves） is also obtained by the interpolation method. An internal friction peak is observed in both the T - tan φ curves and the f - tan φ curves. The activation energy of the peak in the f - tan φ curves is found to be 2.08 ± 0.02 eV and compared to the value of 1.60 ± 0.04 eV in the T - tan φ curves. It is suggested that the change of relaxation strength with temperature should be considered when one calculates the activation energy of the peak in T- tan φ curves.
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.
