Kozuka Y, Susaki T, Hwang H Y
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
Phys Rev Lett. 2008 Aug 29;101(9):096601. doi: 10.1103/PhysRevLett.101.096601. Epub 2008 Aug 27.
We explore the extreme quantum limit of photogenerated electrons in quantum paraelectric SrTiO3. This regime is distinct from conventional semiconductors, due to the large electron effective mass and large dielectric constant. At low temperature, the magnetoresistance and Hall resistivity saturate at a high magnetic field, deviating from conventional behavior. As a result, the Hall coefficient vanishes on the scale of the ratio of the Landau level splitting to the thermal energy, indicating the essential role of lowest Landau level occupancy, as limited by thermal broadening.
我们探索了量子顺电体SrTiO₃中光生电子的极端量子极限。由于电子有效质量大且介电常数大，这一 regime 与传统半导体不同。在低温下，磁阻和霍尔电阻率在高磁场下饱和，偏离了传统行为。因此，霍尔系数在朗道能级分裂与热能之比的尺度上消失，这表明最低朗道能级占据的重要作用，其受热展宽限制。
