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

Juan Salvador-Sánchez; Luis M. Canonico; Ana Pérez-Rodríguez; Tarik P. Cysne; Yuriko Baba; Vito Clericò; Marc Vila; Daniel Vaquero; Juan Antonio Delgado-Notario; José M. Caridad; Kenji Watanabe; Takashi Taniguchi; Rafael A. Molina; Francisco Domínguez-Adame; Stephan Roche; Enrique Diez; Tatiana G. Rappoport; Mario Amado

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

Juan Salvador-Sánchez ; Luis M. Canonico ; Ana Pérez-Rodríguez ; Tarik P. Cysne ; Yuriko Baba ; Vito Clericò ; Marc Vila ; Daniel Vaquero ; Juan Antonio Delgado-Notario ; José M. Caridad ; Kenji Watanabe (National Institute for Materials Science) ; Takashi Taniguchi (National Institute for Materials Science) ; Rafael A. Molina ; Francisco Domínguez-Adame ; Stephan Roche ; Enrique Diez ; Tatiana G. Rappoport ; Mario Amado

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Juan Salvador-Sánchez, Luis M. Canonico, Ana Pérez-Rodríguez, Tarik P. Cysne, Yuriko Baba, Vito Clericò, Marc Vila, Daniel Vaquero, Juan Antonio Delgado-Notario, José M. Caridad, Kenji Watanabe, Takashi Taniguchi, Rafael A. Molina, Francisco Domínguez-Adame, Stephan Roche, Enrique Diez, Tatiana G. Rappoport, Mario Amado. Generation and control of nonlocal chiral currents in graphene superlattices by orbital Hall effect. Physical Review Research. 2024, 6 (2), 023212.

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(abstract)

Graphene-based superlattices offer a new materials playground to exploit and control a higher number of electronic degrees of freedom, such as charge, spin, or valley in disruptive technologies. Recently, orbital effects, emerging in multivalley band structure lacking inversion symmetry, have been discussed as possible new phenomena for developing orbitronics. Here, we report non- local transport measurements in small gap hBN/graphene/hBN moiré superlattices which reveal very strong magnetic field-induced chiral response which is stable up to room temperature. The measured sign dependence of the non-local signal with respect to the magnetic field orientation clearly indicates strong interaction with orbital magnetic moments. Our analysis confirms that such emerging orbital effects can be manipulated by magnetic and electric fields which respectively lift the valley degeneracy and generate transverse flow of valley-dependent orbital magnetic moments. The interpretation of experimental data is well supported by numerical simulations, and the reported phenomenon is a formidable way of in-situ manipulation of the transverse flow of orbital information, that could enable developing (spin)-orbitronic devices.

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