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M.A. and E.D. acknowledge financial support from the Ministerio de Ciencia e Innovacion of Spain (Spanish Ministry of Science, Innovation, and Universities) and FEDER (ERDF: European Regional Development Fund) under Research Grants No. PID2019-106820RB-C21/22, No. PID2022-136285NB-C32, and FEDER/Junta de Castilla y Leon Research Grant No. SA121P20. A.P.-R. acknowledges financial support received from the Marie Sklodowska Curie-COFUND program under the Horizon 2020 research and innovation initiative of the European Union, within the framework of the USAL4Excellence program (Grant Agreement No. 101034371) . D.V. acknowledges financial support from the Ministerio de Universidades (Spain) ( Ph.D. Contract No. FPU19/04224) , including funding from ERDF/FEDER. J.S.-S. acknowledges financial support from the Consejeria de Educacion, Junta de Castilla y Leon, and ERDF/FEDER. L.M.C. acknowledges funding from MCIU/AEI/10.13039/501100011033 and European Union Next GenerationEU/PRTR under Grant No. FJC2021-047300-I. S.R. acknowledges funding from the European Union Seventh Framework Programme under Grant No. 881603 (Graphene Flagship) . The Catalan Institute of Nanoscience and Nanotechnology (ICN2) is funded by the CERCA Programme/Generalitat de Catalunya and supported by the Severo Ochoa programme (MINECO Grant No. SEV-2017-0706. S.R is also supported by MCIU with European funds-NextGenerationEU 324 (PRTR-C17.I1) and by Generalitat de Catalunya. T.G.R. acknowledges funding from FCT-Portugal through Grant No. 2022.07471.CEECIND/CP1718/CT0001 [63] and in the framework of the Strategic Funding UIDB/04650/2020. T.P.C. acknowledges financial support from Brazilian agency CAPES. J.M.C. acknowledges support from the MICINN Ramon y Cajal program (Project No. RYC2019-028443-I) . M.V. was supported as part of the Center for Novel Pathways to Quantum Coherence in Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences. K.W. and T.T. acknowledge support from JSPS KAKENHI (Grants No. 19H05790, No. 20H00354, and No. 21H05233) . J.A.D.-N. acknowledges support from Junta de Castilla y Leon cofunded by FEDER under Research Grant No. SA103P23 and the support from the Universidad de Salamanca for the Maria Zambrano postdoctoral grant funded by the Next Generation EU Funding for the Requalification of the Spanish University System 2021-23, Spanish Ministry of Universities. F.D.-A. and Y.B. were supported by the Recovery, Transformation and Resilience Plan, funded by the European Union NextGenerationEU (Grant No. MAD2D-CM-UCM5) and Ministerio de Ciencia e Innovacion of Spain (Grant No. PID2022-136285NB-C31) . M.A., E.D. and F.D.-A. developed the concept of the experiment. T.T. and K.W. provided hBN crystals. J.S.-S., A.P.-R., V.C., D.V., and J.A.D.-N. performed device fabrication and carried out Raman spectroscopy. J S.-S., A.P.-R.E.D., and M.A. performed transport measurements. J.S.-S. and A.P.-R. performed experimental analysis. J.S.-S., A.P.-R., E.D., and M.A. interpreted results with help from L.M.C., T.G.R., S.R., J.M.C., Y.B., R.A.M, and F.D.-A. Theoretical calculations were performed by L.M.C., T.G.R., T.P.C., M.V., and S.R. The paper and the Supplemental Material were written by T.G.R., M.A., S.R., L.M.C., J.S.-S., A.P.-R., and F. D.-A., with additional contributions from all authors.The authors declare that they have no competing interests.r through Grant No. 2022.07471.CEECIND/CP1718/CT0001 [63] and in the framework of the Strategic Funding UIDB/04650/2020. T.P.C. acknowledges financial support from Brazilian agency CAPES. J.M.C. acknowledges sup-port from the MICINN Ramon y Cajal program (Project No. RYC2019-028443-I) . M.V. was supported as part of the Center for Novel Pathways to Quantum Coherence in Ma-terials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences. K.W. and T.T. acknowledge support from JSPS KAKENHI (Grants No. 19H05790, No. 20H00354, and No. 21H05233) . J.A.D.-N. acknowledges support from Junta de Castilla y Leon cofunded by FEDER under Research Grant No. SA103P23 and the support from the Universidad de Sala-manca for the Maria Zambrano postdoctoral grant funded by the Next Generation EU Funding for the Requalification of the Spanish University System 2021-23, Spanish Min-istry of Universities. F.D.-A. and Y.B. were supported by the Recovery, Transformation and Resilience Plan, funded by the European Union NextGenerationEU (Grant No. MAD2D-CM-UCM5) and Ministerio de Ciencia e Innovacion of Spain (Grant No. PID2022-136285NB-C31) . M.A., E.D. and F.D.-A. developed the concept of the exper-iment. T.T. and K.W. provided hBN crystals. J.S.-S., A.P.-R., V.C., D.V., and J.A.D.-N. performed device fabrication and carried out Raman spectroscopy. J S.-S., A.P.-R.E.D., and M.A. performed transport measurements. J.S.-S. and A.P.-R. performed experimental analysis. J.S.-S., A.P.-R., E.D., and M.A. interpreted results with help from L.M.C., T.G.R., S.R., J.M.C., Y.B., R.A.M, and F.D.-A. Theoretical calculations were performed by L.M.C., T.G.R., T.P.C., M.V., and S.R. The paper and the Supplemental Material were written by T.G.R., M.A., S.R., L.M.C., J.S.-S., A.P.-R., and F. D.-A., with additional contributions from all authors. The authors declare that they have no competing interests.

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Generation and control of nonlocal chiral currents in graphene superlattices by orbital Hall effect

Publicado en:PHYSICAL REVIEW RESEARCH. 6 (2): 023212- - 2024-05-28 6(2), DOI: 10.1103/PhysRevResearch.6.023212

Autores: Salvador-Sanchez, Juan; Canonico, Luis M; Perez-Rodriguez, Ana; Cysne, Tarik P; Baba, Yuriko; Clerico, Vito; Vila, Marc; Vaquero, Daniel; Delgado-Notario, Juan Antonio; Caridad, Jose M; Watanabe, Kenji; Taniguchi, Takashi; Molina, Rafael A; Dominguez-Adame, Francisco; Roche, Stephan; Diez, Enrique; Rappoport, Tatiana G; Amado, Mario

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Resumen

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 moir & eacute; 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.

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