GaAs/AlAs量子线超晶格能量结构的磁声子共振研究与表征
Study and characterization by magnetophonon resonance of the energy structuring in GaAs/AlAs quantum-wire superlattices
摘要：
利用磁声子共振技术，在高达35 T的脉冲磁场作用下，研究了GaAs/AlAs量子线一维超晶格的能带结构.这些样品是通过“原子锯法”从原始的量子阱2D超晶格中产生的，它们的能带在体的X态上进行了实质性的修改。我们用有限元方法计算了能带结构，并研究了GaAs和AlAs在点X处由质量m_t和m_l组成的各种微带结构。从实验的角度来看，主要的结果是，在2D的情况下，我们只观察到共振时，磁场B是沿生长轴，而在1D的情况下，我们得到的所有磁场配置的共振。分析电阻率ρ_xy随B的变化的最大值（或B // E的最小值），可以定性和半定量地解释理论上预期的能带结构。
英文摘要：
We present the characterization of the band structure of GaAs/AlAs quantum-wire 1D superlattices performed by magnetophonon resonance with pulsed magnetic fields up to 35 T. The samples, generated by the "atomic saw method" from original quantum-well 2D superlattices, underwent substantial modifications of their energy bands built up on the X-states of the bulk. We have calculated the band structure by a finite element method and we have studied the various miniband structures built up of the masses m_t and m_l of GaAs and AlAs at the point X. From an experimental point of view, the main result is that in the 2D case we observe only resonances when the magnetic field B is applied along the growth axis whereas in the 1D case we obtain resonances in all magnetic field configurations. The analysis of the maxima (or minima for B // E) in the resistivity rho_xy as a function of B allows us to account, qualitatively and semi-quantitatively, for the band structure theoretically expected.
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