Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D43: Topological Superconductivity in Engineered Heterostructures
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 317
Sponsoring
Unit:
DMP
Chair: Cui-Zu Chang, The Pennsylvania State University; Igor Zutic, State Univ of NY - Buffalo
Abstract: D43.00009 : Topological nodal-point superconductivity in a 2D-antiferromagnet/superconductor hybrid system*
5:00 PM–5:12 PM
Presenter:
Roberto Lo Conte
(University of Hamburg)
Authors:
Roberto Lo Conte
(University of Hamburg)
Maciej Bazarnik
(University of Hamburg; Poznan University of Technology)
Eric Mascot
(University of Melbourne)
Dirk K Morr
(University of Illinois at Chicago)
Kirsten von Bergmann
(University of Hamburg)
Roland M Wiesendanger
(University of Hamburg)
Here, we present the discovery of a topological nodal-point superconducting phase in a hybrid system consisting of antiferromagnetic manganese (Mn) monolayer islands on top of the s-wave superconductor niobium (Nb) [9]. The novel topological superconducting phase was discovered via a low-temperature spin-polarized scanning tunneling microscopy and spectroscopy investigation. Low-energy edge modes are observed at the boundaries of the magnetic islands, separating the topological phase from the trivial one. In accordance to tight-binding calculations, we find that the relative spectral weight of the edge modes depends on the edge’s atomic configuration, which is a fingerprint of the discovered topological superconducting state. Our results establish the combination of antiferromagnetism and superconductivity as a novel route to design 2D topological quantum phases.
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[2] H. Kim et al., Sci. Adv. 4, eaar5251 (2018).
[3] A. Palacio-Morales et al., Sci. Adv. 5, eaav6600 (2019).
[4] L. Schneider et al., Nat. Phys. 17, 943-948 (2021).
[5] J. Li et al., Nat. Commun. 7:12297 (2016).
[6] S. Kezilebieke et al., Nature 588, 424 (2020).
[7] A. P. Schnyder, et al., Phys. Rev. B. 78, 195125 (2008).
[8] C. Chiu, et al. Rev. Mod. Phys., 88, 035005 (2016).
[9] R. Lo Conte et al., Phys. Rev. B 105, L100406 (2022). M. Bazarnik et al., arXiv:2208.12018 (2022).
*EU Marie Curie Fellowship (748006). Deutsche Forschungsgemeinschaft (DFG) Projects No. 459025680, 418425860. Polish Ministry of Education and Science within Project No. 0512/SBAD/2220. EU ERC Advanced Grant ADMIRE (786020). DFG Cluster of Excellence 'Advanced Imaging of Matter' (EXC 2056 - project ID 390715994). Australian Research Council project DP200101118. U. S. DoE, Office of Science, Basic Energy Sciences, Award No. DE-FG02-05ER46225.
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