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arXiv 0811.4639cond-mat.mtrl-scicond-mat.mes-hall
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MgxZn1-xO/ZnO异质结中二维电子的自旋极化率和有效质量

Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1-xO/ZnO heterostructures

A. Tsukazaki, A. Ohtomo, M. Kawasaki, S. Akasaka, H. Yuji, K. Tamura, K. Nakahara, T. Tanabe, A. Kamisawa, T. Gokmen, J. Shabani, M. Shayegan

摘要:

我们报告的测量自旋磁化率和电子有效质量的二维电子限制在界面的MgxZn 1-xO/ZnO单异质结构(x = 0.05,0.08,和0.11),生长在(0001)ZnO衬底上的分子束外延。通过控制势垒成分来调节内置极化,电子密度在5.6 x 10^11 ~ 1.6 x 10^12 cm^-2范围内系统地变化,对应的范围为3.1 < rs < 5.2,其中rs是以有效玻尔半径为单位测量的平均电子间距。我们使用符合技术,自旋分裂朗道能级的交叉发生在磁场的临界倾斜角,以评估自旋磁化率。此外,我们确定了有效质量的温度依赖性的Shubnikov-de Haas振荡测量符合条件。磁化率和有效质量都随着电子密度的减小而逐渐增大,反映了电子-电子相互作用的作用。

英文摘要:

We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of MgxZn1-xO/ZnO single heterostructures (x = 0.05, 0.08, and 0.11), grown by molecular-beam epitaxy on (0001) ZnO substrates. By tuning the built-in polarization through control of the barrier composition, the electron density was systematically varied in the range of 5.6 x 10^11 to 1.6 x 10^12 cm^-2, corresponding to a range of 3.1 < rs < 5.2, where rs is the average electron spacing measured in units of the effective Bohr radius. We used the coincidence technique, where crossings of the spin-split Landau levels occur at critical tilt angles of magnetic field, to evaluate the spin susceptibility. In addition, we determined the effective mass from the temperature dependence of the Shubnikov-de Haas oscillations measured at the coincidence conditions. The susceptibility and the effective mass both gradually increase with decreasing electron density, reflecting the role of electron-electron interaction.

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