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arXiv · 0912.3731

Tunable Rashba spin-orbit interaction at oxide interfaces

A. D. Caviglia·M. Gabay·S. Gariglio·N. Reyren·C. Cancellieri·J. -M. Triscone
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Abstract

The quasi-two-dimensional electron gas found at the LaAlO3/SrTiO3 interface offers exciting new functionalities, such as tunable superconductivity, and has been proposed as a new nanoelectronics fabrication platform. Here we lay out a new example of an electronic property arising from the interfacial breaking of inversion symmetry, namely a large Rashba spin-orbit interaction, whose magnitude can be modulated by the application of an external electric field. By means of magnetotransport experiments we explore the evolution of the spin-orbit coupling across the phase diagram of the system. We uncover a steep rise in Rashba interaction occurring around the doping level where a quantum critical point separates the insulating and superconducting ground states of the system.

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A. D. Caviglia, M. Gabay, S. Gariglio, N. Reyren, C. Cancellieri, J. -M. Triscone. 2009-12-18. Tunable Rashba spin-orbit interaction at oxide interfaces. https://doi.org/10.1103/physrevlett.104.126803

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