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arXiv 1503.00967cond-mat.supr-concond-mat.mtrl-sci
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顶栅LaAlO3/SrTiO3器件超导电性和Rashba自旋轨道耦合的场效应控制

Field-effect control of superconductivity and Rashba spin-orbit coupling in top-gated LaAlO3/SrTiO3 devices

S. Hurand, A. Jouan, C. Feuillet-Palma, G. Singh, J. Biscaras, E. Lesne, N. Reyen, A. Barthelemy, M. Bibes, C. Ulysse, X. Lafosse, M. Pannetier-Lecoeur, S. Capr… 展开作者

S. Hurand, A. Jouan, C. Feuillet-Palma, G. Singh, J. Biscaras, E. Lesne, N. Reyen, A. Barthelemy, M. Bibes, C. Ulysse, X. Lafosse, M. Pannetier-Lecoeur, S. Caprara, M. Grilli, J. Lesueur, N. Bergeal

摘要:

人工氧化物异质结构制造的最新发展通过实现电荷、自旋和轨道自由度的操纵,在量子材料领域开辟了新的途径。在这种情况下,二维电子气(2-DEG)在LAlO 3/SrTiO 3界面,表现出超导性和强Rashba自旋轨道耦合(SOC)的发现,代表了一个重大突破。在这里,我们报告的实现场效应LaAlO 3/SrTiO 3设备,其物理特性,包括超导性和SOC,可以在很宽的范围内由顶栅电压调谐。我们推导出一个相图,强调场效应诱导的超导体到绝缘体的量子相变。磁输运测量表明,Rashba耦合常数与静电掺杂线性增加。我们的研究结果为实现介观器件铺平了道路,在介观器件中,这两个属性可以通过顶门在局部范围内进行操纵。

英文摘要:

The recent development in the fabrication of artificial oxide heterostructures opens new avenues in the field of quantum materials by enabling the manipulation of the charge, spin and orbital degrees of freedom. In this context, the discovery of two-dimensional electron gases (2-DEGs) at LAlO3/SrTiO3 interfaces, which exhibit both superconductivity and strong Rashba spin-orbit coupling (SOC), represents a major breakthrough. Here, we report on the realisation of a field-effect LaAlO3/SrTiO3 device, whose physical properties, including superconductivity and SOC, can be tuned over a wide range by a top-gate voltage. We derive a phase diagram, which emphasises a field-effect-induced superconductor-to-insulator quantum phase transition. Magneto-transport measurements indicate that the Rashba coupling constant increases linearly with electrostatic doping. Our results pave the way for the realisation of mesoscopic devices, where these two properties can be manipulated on a local scale by means of top-gates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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