Effects of spin orbit coupling in superconducting proximity devices -- application to CoSi2/TiSi2 heterostructures

Stefan Kirchner^1,2*, Shao-Pin Chiu^1,2, Vivek Mishra³, Yu Li³, Fu-Chun Zhang^3,4, Juhn-Jong Lin^1,2

¹Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
²Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
³Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing, China
⁴CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, China

* Presenter:Stefan Kirchner, email:kirchner@nycu.edu.tw

Early proposals for creating Majorana zero modes involve spin triplet superconductivity while almost all known superconductors belong to the spin singlet class with a few possible exceptions. As a result, a variety of ingenious heterostructures of superconducting nano-wires have been proposed to generate the required p-wave pairing component.
In this presentation, I will review the recent findings of two-component superconductivity with a dominant p-wave component in CoSi2/TiSi2 heterostructures [1,2]. In particular, I will review the effect of interface induced Rashba spin orbit coupling on the conductance of a three terminal ``T" shape superconducting device and present our calculations for the differential conductance for this device within the quasi-classical formalism that includes the mixing of triplet-singlet pairing due to the Rashba spin orbit coupling [3].

[1] [S.-P. Chiu, C. C. Tsuei, S.-S. Yeh, F.-C. Zhang, S. Kirchner, and J.-J. Lin, Science Advances 7, eabg6569 (2021).
[2] S.-P. Chiu, V. Mishra, Y. Li, F.-C. Zhang, S. Kirchner, and J.-J. Lin, arXiv:2202.08989 (2022).
[3] Vivek Mishra, Yu Li, Fu-Chun Zhang, and Stefan Kirchner, Phys. Rev. B 103, 184505 (2021).

Keywords: p-wave superconductivity, spin-orbit coupling, proximity effect, odd-frequency pairing