Terahertz spin-light coupling in proximitized Dirac materials
Denisov, Konstantin S. (State University of New York. Department of Physics)
Rozhansky, Igor V. (Ioffe Institute)
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia)
Žutić, Igor (State University of New York. Department of Physics)

Date:	2024
Abstract:	The two-dimensional (2D) materials are highly susceptible to the influence of their neighbors, thereby enabling the design by proximity phenomena. We reveal a remarkable terahertz (THz) spin-light interaction in 2D Dirac materials that arises from magnetic and spin-orbital proximity effects. The dynamical realization of the spin-charge conversion, the electric dipole spin resonance (EDSR), of Dirac electrons displays distinctive THz features upon emerging spin-pseudospin proximity terms in the Hamiltonian. To capture the effect of fast pseudospin dynamics on the electron spin, we develop a mean-field theory and complement it with a quantum-mechanical treatment. As a specific example, we investigate the THz response of a single graphene layer proximitized by a magnetic substrate. Our analysis demonstrates a strong enhancement and anomalous polarization structure of the THz-light absorption, which can enable THz detection and efficient generation and control of spins in spin-based quantum devices. The identified coupled spin-pseudospin dynamics is not limited to EDSR and may influence a broad range of optical, transport, and ultrafast phenomena.
Grants:	Agencia Estatal de Investigación PID2019-111773RB-I00 Agencia Estatal de Investigación PID2022-143162OB-I00 Agencia Estatal de Investigación CEX2021-001214-S
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Dirac electrons ; Electric dipole spin resonance ; Light couplings ; Light interaction ; Magnetic orbitals ; Proximity effects ; Pseudospin ; Spin-orbitals ; Tera Hertz ; Two-dimensional
Published in:	Physical review B, Vol. 109, Issue 20 (May 2024) , art. L201406, ISSN 2469-9969

DOI: 10.1103/PhysRevB.109.L201406

Postprint 9 p, 4.3 MB

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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