Regensburg 2022 – wissenschaftliches Programm

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TUT: Tutorien

TUT 2: 2D Quantum Materials and Heterostructures: From Fabrication to Applications (joint session HL/TUT)

TUT 2.4: Tutorium

Sonntag, 4. September 2022, 17:45–18:20, H2

Introduction to 2D superconducting spintronics — •Elke Scheer — Department of Physics, University of Konstanz, Konstanz

The proximity effect between a conventional (s-wave) 3D superconductor (S) and a ferromagnet (F) can lead to the formation of Cooper pairs with parallel-spin (spin-triplet) alignment instead of the conventional antiparallel-spin (spin-singlet) state. The demonstration of spin-triplet generation in S/F systems [1,2] has inaugurated the field of superconducting spintronics aiming at developing energy-efficient spintronic devices [3]. Both superconductivity and ferromagnetism depend on the dimensionality of the system, but have been shown to exist in 2D or quasi-2D systems [4,5]. The possibility to exfoliate layered van der Waals (vdW) materials down to the few-layer limit [6] in combination with the existence of S and of F vdW materials makes this material basis in particular promising to explore triplet S in 2DS/2DF heterostructures. In this tutorial talk I will briefly recall the physics of SF spintronics in 3D, before I will describe the particular properties and challenges in the investigation of 2D-SF hybrid systems and give an overview over the so far best-studied material combinations and target devices.

[1] R. Keizer et al., Nature 95, 825 (2006)

[2] A. Buzdin, Rev. Mod. Phys. 77, 935 (2005)

[3] J. Linder & J. Robinson, Nature Phys. 11, 307 (2015)

[4] B. Huang et al., Nature 546, 270 (2017)

[5] M. Smidman et al., Rep. Prog. Phys. 80, 036501 (2017)

[6] A. K. Geim & I. V. Grigorieva, Nature 499, 419 (2013).