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arXiv 0708.1669cond-mat.mes-hallcond-mat.dis-nn
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GaAs δ掺杂量子线超晶格的量子霍尔效应和Shubnikov de Haas振荡表征

GaAs delta-doped quantum wire superlattice characterization by quantum Hall effect and Shubnikov de Haas oscillations

T. Ferrus, B. Goutiers, J. Galibert, L. Ressier, J. P. Peyrade

摘要:

通过量子阱超晶格(2D)中的受控位错滑移(原子锯方法)实现的量子线超晶格(1D)已经显示出磁声子振荡。这种效应已被用来研究这种系统的电子性质,并证明了量子特性的物理性质的线。通过冷却温度和使用高达35 T的脉冲磁场,我们观察到了量子霍尔效应(QHE)和Shubnikov de Haas(SdH)振荡的各种配置的磁场。由基场值导出的有效质量与由磁声子效应得到的有效质量是一致的。场的旋转会引起共振频率的变化,这是由于质量张量的改变,就像在(3D)电子气中一样。从QHE的观点来看,rho_yz中的平台相对于rho_zz最小值是退相的,这似乎与加宽的朗道能级的态密度最小值的退相有关。

英文摘要:

Quantum wire superlattices (1D) realized by controlled dislocation slipping in quantum well superlattices (2D) (atomic saw method) have already shown magnetophonon oscillations. This effect has been used to investigate the electronic properties of such systems and prove the quantum character of the physical properties of the wires. By cooling the temperature and using pulsed magnetic field up to 35 T, we have observed both quantum Hall effect (QHE) and Shubnikov de Haas (SdH) oscillations for various configurations of the magnetic field. The effective masses deduced from the values of the fundamental fields are coherent with those obtained with magnetophonon effect. The field rotation induces a change in the resonance frequencies due to the modification of the mass tensor as in a (3D) electron gas. In view the QHE, the plateaus observed in rho_yz are dephased relatively to rho_zz minima which seems to be linked to the dephasing of the minima of the density of states of the broadened Landau levels.

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