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arXiv 1207.7003cond-mat.mtrl-scicond-mat.str-el
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二维电子气在LaAlO3/SrTiO3界面上的量子振荡和子带性质

Quantum oscillations and subband properties of the two-dimensional electron gas at the LaAlO3/SrTiO3 interface

A. McCollam, S. Wenderich, M. K. Kruize, V. K. Guduru, H. J. A. Molegraaf, M. Huijben, G. Koster, D. H. A. Blank, G. Rijnders, A. Brinkman, H. Hilgenkamp, U. Zeitler, J. C. Maan

摘要:

我们进行了高场磁输运测量,研究界面电子气在LaAlO 3/SrTiO 3异质结构。Shubnikov-de Haas振荡揭示了几个二维导带,载流子有效质量在1 ~ 3 m_e之间,量子迁移率为3000 cm ^2/V·s量级,带边仅比费米能低几个毫伏。在倾斜磁场中的测量证实了电子气的二维特征,并显示了子带间散射的证据。

英文摘要:

We have performed high field magnetotransport measurements to investigate the interface electron gas in LaAlO3/SrTiO3 heterostructures. Shubnikov-de Haas oscillations reveal several 2D conduction subbands with carrier effective masses between 1 and 3 m_e, quantum mobilities of order 3000 cm^2/V s, and band edges only a few millielectronvolts below the Fermi energy. Measurements in tilted magnetic fields confirm the 2D character of the electron gas, and show evidence of inter-subband scattering.

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