Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel Aviv, 69978, Israel.
Phys Rev Lett. 2010 Nov 12;105(20):206401. doi: 10.1103/PhysRevLett.105.206401. Epub 2010 Nov 9.
Quantum magnetic oscillations in SrTiO3/LaAlO3 interface are observed in the magnetoresistance. We study their frequency as a function of gate voltage and the evolution of their amplitude with temperature. The data are consistent with the Shubnikov-de Haas theory. The Hall resistivity ρ(xy) is nonlinear at low magnetic fields. ρ(xy) is fitted assuming multiple carrier contributions. We infer the density of the mobile charge carriers from the oscillations frequency and from Hall measurements. The comparison between these densities suggests multiple valley and spin degeneracy. The small amplitude of the oscillation is discussed in the framework of the multiple band scenario.
在磁阻中观察到 SrTiO3/LaAlO3 界面中的量子磁振荡。我们研究了它们的频率作为栅极电压的函数以及它们随温度的幅度演化。这些数据与舒布尼科夫-德哈斯理论一致。在低磁场下，霍尔电阻率 ρ(xy)是非线性的。假设存在多种载流子贡献，对 ρ(xy) 进行拟合。我们从振荡频率和霍尔测量推断出可移动电荷载流子的密度。这些密度的比较表明存在多个谷和自旋简并。在多能带情况下对振荡的小幅度进行了讨论。
