Generation and control of nonlocal chiral currents in graphene superlattices by orbital Hall effect
Salvador-Sánchez, Juan (Universidad de Salamanca)
Canonico, Luis M. (Institut Català de Nanociència i Nanotecnologia)
Pérez-Rodríguez, Anna (Universidad de Salamanca)
Cysne, Tarik P. (Universidade Federal Fluminense)
Baba, Yuriko (Universidad Complutense de Madrid. Departamento de Física de Materiales)
Clericò, Vito (Universidad de Salamanca)
Vila Tusell, Marc (Institut Català de Nanociència i Nanotecnologia)
Vaquero, Daniel (Universidad de Salamanca)
Delgado-Notario, Juan A. (Universidad de Salamanca)
Caridad, José M. (Universidad de Salamanca)
Watanabe, Kenji (National Institute for Materials Science)
Taniguchi, Takashi (National Institute for Materials Science)
Molina, Rafael A. (Consejo Superior de Investigaciones Científicas (Espanya). Instituto de Estructura de la Materia)
Domínguez-Adame, Francisco (Universidad Complutense de Madrid. Departamento de Física de Materiales)
Roche, Stephan (Institut Català de Nanociència i Nanotecnologia)
Diez, Enrique (Universidad de Salamanca)
Rappoport, Tatiana Gabriela (Universidade Federal do Rio de Janeiro. Instituto de Física)
Amado, Mario (Universidad de Salamanca)

Date:	2024
Abstract:	Graphene-based superlattices offer a unique materials playground to exploit and control a higher number of electronic degrees of freedom, such as charge, spin, or valley for disruptive technologies. Recently, orbital effects, emerging in multivalley band structures lacking inversion symmetry, have been discussed as possible mechanisms for developing orbitronics. Here, we report nonlocal transport measurements in small gap hBN/graphene/hBN moiré superlattices which reveal very strong magnetic field-induced chiral response which is stable up to sizable temperatures. The measured sign dependence of the nonlocal signal with respect to the magnetic field orientation clearly indicates the manifestation of emerging orbital magnetic moments. The interpretation of experimental data is well supported by numerical simulations, and the reported phenomenon stands as a formidable way of in situ manipulation of the transverse flow of orbital information that could enable the design of orbitronic devices.
Grants:	Agencia Estatal de Investigación PID2019-106820RB-C21 Agencia Estatal de Investigación PID2019-106820RB-C22 Agencia Estatal de Investigación PID2022-136285NB-C32 European Commission 101034371 Agencia Estatal de Investigación FJC2021-047300-I European Commission 881603 Agencia Estatal de Investigación SEV-2017-0706 Agencia Estatal de Investigación RYC2019-028443-I Agencia Estatal de Investigación PID2022-136285NB-C31
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical Review Research, Vol. 6, Issue 2 (May 2024) , art. 23212, ISSN 2643-1564

DOI: 10.1103/PhysRevResearch.6.023212

11 p, 2.4 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles