Topological properties of finite-size heterostructures of magnetic topological insulators and superconductors

Bound-states; Edge state; Finite size; Insulator-superconductor; Majorana; One-dimensional; Superconductor heterostructures; Topological insulators; Topological properties; Two-dimensional; Electronic, Optical and Magnetic Materials; Condensed Matter Physics; Physics - Mesoscopic Systems and Quantum Hall Effect

Abstract :

[en] Heterostructures of magnetic topological insulators (MTIs) and superconductors (SCs) in two-dimensional (2D) slab and one-dimensional (1D) nanoribbon geometries have been predicted to host, respectively, chiral Majorana edge states (CMESs) and Majorana bound states (MBSs). We study the topological properties of such MTI/SC heterostructures upon variation of the geometry from wide slabs to quasi-1D nanoribbon systems and as a function of the chemical potential, the magnetic doping, and the induced superconducting pairing potential. To do so, we construct effective symmetry-constrained low-energy Hamiltonians accounting for the real-space confinement. For a nanoribbon geometry with finite width and length, we observe different phases characterized by CMESs, MBSs, as well as coexisting CMESs and MBSs, as the chemical potential, the magnetic doping, and/or the width are varied.

Disciplines :

Physics

Author, co-author :

LEGENDRE, Julian ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Physics and Materials Science > Team Thomas SCHMIDT

ZSURKA, Eduard ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Jülich, Germany ; JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich, RWTH Aachen University, Jülich, Germany

Di Miceli, Daniele ; Department of Physics and Materials Science, University of Luxembourg, Luxembourg, Luxembourg ; Institute for Cross-Disciplinary Physics and Complex Systems (IFISC) (CSIC-UIB), Palma, Spain

Serra, Llorenç ; Institute for Cross-Disciplinary Physics and Complex Systems (IFISC) (CSIC-UIB), Palma, Spain ; Department of Physics, University of the Balearic Islands, Palma, Spain

MOORS, Kristof ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Physics and Materials Science ; Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Jülich, Germany ; JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich, RWTH Aachen University, Jülich, Germany

SCHMIDT, Thomas ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)

External co-authors :

yes

Language :

English

Title :

Topological properties of finite-size heterostructures of magnetic topological insulators and superconductors

Publication date :

15 August 2024

Journal title :

Physical Review. B

ISSN :

2469-9950

eISSN :

2469-9969

Publisher :

American Physical Society

Volume :

110

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Funding text :

This project is financially supported by the QuantERA grant MAGMA, by the National Research Fund Luxembourg under Grant No. INTER/QUANTERA21/16447820/MAGMA, by the German Research Foundation under Grant No. 491798118, by MCIN/AEI/10.13039/501100011033 under Project No. PCI2022-132927, and by the European Union NextGenerationEU/PRTR. L.S. acknowledges support from Grants No. PID2020-117347GB-I00 funded by MCIN/AEI/10.13039/501100011033 and No. PDR2020-12 funded by GOIB. K.M. acknowledges financial support by the Bavarian Ministry of Economic Affairs, Regional Development, and Energy under Grant No. 07 02/686 58/1/21 1/22 2/23 and by the German Federal Ministry of Education and Research (BMBF) via the Quantum Future project MajoranaChips (Grant No. 13N15264) within the funding program Photonic Research Germany.This project is financially supported by the QuantERA grant MAGMA, by the National Research Fund Luxembourg under Grant No. INTER/QUANTERA21/16447820/MAGMA, by the German Research Foundation under Grant No. 491798118, by MCIN/AEI/10.13039/501100011033 under Project No. PCI2022-132927, and by the European Union NextGenerationEU/PRTR. L.S. acknowledges support from Grants No. PID2020-117347GB-I00 funded by MCIN/AEI/10.13039/501100011033 and No. PDR2020-12 funded by GOIB. K.M. acknowledges financial support by the Bavarian Ministry of Economic Affairs, Regional Development, and Energy under Grant No. 07 02/686 58/1/21 1/22 2/23 and by the German Federal Ministry of Education and Research (BMBF) via the Quantum Future project \u201CMajoranaChips\u201D (Grant No. 13N15264) within the funding program Photonic Research Germany.

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