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HL: Fachverband Halbleiterphysik
HL 54: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices III (joint session HL/TT)
HL 54.5: Invited Talk
Friday, March 22, 2024, 11:45–12:15, EW 202
Superconducting proximity effect in topological Dirac materials — •Chuan Li1, Anqi Wang2, Caizhen Li2, Chhunguang Chu2, Zhimin Liao2, and Alexander Brinkman1 — 1MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands. — 2State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, Peking University, 100871 Beijing, China
Inducing superconductivity in topological materials stimulates the formation of novel quantum states of matter. Besides the original prediction in 3D topological insulators, the notion of topological phases has been generalized to different dimensions and extended to the higher-order states.
In the last few years, our research has demonstrated the possibility of realizing the topological superconductivity in engineered 3D topological insulators, 3D Dirac semimetals [1,2], and their 1D hinge states. Particularly, Cd3As2 is predicted to be a higher-order topological semimetal, possessing three-dimensional bulk Dirac fermions, two-dimensional Fermi arcs [3], and one-dimensional hinge states [4] or non-Hermitian states [5]. These topological states have different characteristic length scales in electronic transport. We show that the superconducting proximity effect can be a sensitive probe for distinguishing these states.
[1] Li, C. et al. Nat. Mater. 17, 875 (2018). [2] Wang, A. Q. et al. PRL (2018). [3] Li, C.-Z. et al. Nat. Commun.(2020). [4] Li, C.-Z. et al. PRL (2020). [5] C. G. Chu, et al., Nat. Commun. (2023).
Keywords: Superconducting proximity effect; Josephson junction; Topological Dirac semimetal; Majorana bound state; higher-order topological states