High mobility Si/Si_(l-x)Ge_(x)/Si p-type modulation-doped double heterostructures have been grown by RRH/VLP-CVD(rapid radiant heating/very low pressure-CVD).Hole Hall mobilities as high as about 300cm^(2)/V.s(293 K)...High mobility Si/Si_(l-x)Ge_(x)/Si p-type modulation-doped double heterostructures have been grown by RRH/VLP-CVD(rapid radiant heating/very low pressure-CVD).Hole Hall mobilities as high as about 300cm^(2)/V.s(293 K)and 7500cm^(2)/V.s(77K)have been obtained for heterostructures with x=0.3.The variation of hole mobility with temperature and the influence of Ge fraction on hole mobility were investigated.展开更多
Two-dimensional properties of grain boundaries in germanium bicrystals are studied at liquid helium temperature ranging from 1.6 to 4.2 K.The experimental results indicate that the magnetoresistivity for 8°tilt a...Two-dimensional properties of grain boundaries in germanium bicrystals are studied at liquid helium temperature ranging from 1.6 to 4.2 K.The experimental results indicate that the magnetoresistivity for 8°tilt angle increases exponentially with the magnetic held intensity square in weak magnetic field and with the linear magnetic field intensity in strong magnetic field.The phenomena are explainable with the percolation theory.展开更多
The anomalous dips A_(1)A_(2) of mobility of zero-gap Hg_(1-x)Cd_(x)Te in temperature range about 12K and 28K have been studied.The Hall coefficients vs.temperature are measured in high magnetic field.It shows that in...The anomalous dips A_(1)A_(2) of mobility of zero-gap Hg_(1-x)Cd_(x)Te in temperature range about 12K and 28K have been studied.The Hall coefficients vs.temperature are measured in high magnetic field.It shows that instead of the interband optical phonon scattering,the anomalous dip A_(2) is caused by the acceptor resonant state.展开更多
文摘High mobility Si/Si_(l-x)Ge_(x)/Si p-type modulation-doped double heterostructures have been grown by RRH/VLP-CVD(rapid radiant heating/very low pressure-CVD).Hole Hall mobilities as high as about 300cm^(2)/V.s(293 K)and 7500cm^(2)/V.s(77K)have been obtained for heterostructures with x=0.3.The variation of hole mobility with temperature and the influence of Ge fraction on hole mobility were investigated.
文摘Two-dimensional properties of grain boundaries in germanium bicrystals are studied at liquid helium temperature ranging from 1.6 to 4.2 K.The experimental results indicate that the magnetoresistivity for 8°tilt angle increases exponentially with the magnetic held intensity square in weak magnetic field and with the linear magnetic field intensity in strong magnetic field.The phenomena are explainable with the percolation theory.
文摘The anomalous dips A_(1)A_(2) of mobility of zero-gap Hg_(1-x)Cd_(x)Te in temperature range about 12K and 28K have been studied.The Hall coefficients vs.temperature are measured in high magnetic field.It shows that instead of the interband optical phonon scattering,the anomalous dip A_(2) is caused by the acceptor resonant state.
