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A Two-Dimensional Superconducting Electron Gas in Freestanding LaAlO3/SrTiO3 Micromembranes
Nano Letters ( IF 10.8 ) Pub Date : 2022-06-09 , DOI: 10.1021/acs.nanolett.2c00992
Ricci Erlandsen 1 , Rasmus Tindal Dahm 1 , Felix Trier 1 , Mario Scuderi 2 , Emiliano Di Gennaro 3 , Alessia Sambri 4 , Charline Kaisa Reffeldt Kirchert 1 , Nini Pryds 1 , Fabio Miletto Granozio 4 , Thomas Sand Jespersen 5
Affiliation  

Freestanding oxide membranes constitute an intriguing material platform for new functionalities and allow integration of oxide electronics with technologically important platforms such as silicon. Sambri et al. recently reported a method to fabricate freestanding LaAlO3/SrTiO3 (LAO/STO) membranes by spalling of strained heterostructures. Here, we first develop a scheme for the high-yield fabrication of membrane devices on silicon. Second, we show that the membranes exhibit metallic conductivity and a superconducting phase below ∼200 mK. Using anisotropic magnetotransport we extract the superconducting phase coherence length ξ ≈ 36–80 nm and establish an upper bound on the thickness of the superconducting electron gas d ≈ 17–33 nm, thus confirming its two-dimensional character. Finally, we show that the critical current can be modulated using a silicon-based backgate. The ability to form superconducting nanostructures of LAO/STO membranes, with electronic properties similar to those of the bulk counterpart, opens opportunities for integrating oxide nanoelectronics with silicon-based architectures.

中文翻译:

独立式 LaAlO3/SrTiO3 微膜中的二维超导电子气体

独立式氧化物膜构成了一个有趣的新功能材料平台,并允许将氧化物电子器件与技术上重要的平台(如硅)集成。桑布里等人。最近报道了一种通过剥落应变异质结构来制造独立式 LaAlO 3 /SrTiO 3 (LAO/STO) 膜的方法。在这里,我们首先开发了一种在硅上高产制造薄膜器件的方案。其次,我们表明膜表现出金属导电性和低于~200 mK的超导相。使用各向异性磁输运,我们提取了超导相相干长度 ξ ≈ 36-80 nm,并建立了超导电子气d厚度的上限≈ 17-33 nm,从而证实了它的二维特征。最后,我们展示了可以使用基于硅的背栅来调制临界电流。形成 LAO/STO 膜的超导纳米结构的能力,具有与体对应物相似的电子特性,为将氧化物纳米电子学与硅基结构集成提供了机会。
更新日期:2022-06-09
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