Terahertz spin resonance of proximitized Dirac electrons

Konstantin Denisov; Igor Rozhansky; Sergio Valenzuela; Igor Zutic

doi:10.1117/12.2677566

28 September 2023 Terahertz spin resonance of proximitized Dirac electrons

Konstantin Denisov, Igor Rozhansky, Sergio Valenzuela, Igor Zutic

Proceedings Volume PC12656, Spintronics XVI; PC126560H (2023) https://doi.org/10.1117/12.2677566
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States

Abstract

In this work we investigate spin-light coupling phenomena in van der Waals heterostructures (vdWs) consisting of two-dimensional Dirac crystals proximitized by a magnetic layer. A strong magnetic proximity effect results in the modification of the 2D electron spectrum with the appearance of different spin splitting terms and electron’s equilibrium spin polarization. Motivated by these factors we have explored the resonant spin generation of proximitized Dirac electrons by terahertz ac-electric field and have revealed the existence of a new scenario for the electric dipole spin resonance (EDSR). We pay special attention to the resonant spin dynamics of electrons in case of magnetically proximitized single graphene layer, and discuss emerging EDSR features unrepresented for systems with parabolic spectrum. The estimations demonstrate the enhancement of EDSR in a graphene layer featured in addition by an anomalous polarization structure of the absorption coefficient. The developed theory allowed us to come up with a proposal for a THz detector, in which the photogenerated nonequilibrium spin polarization in graphene can be read out by means of the Johnson-Silsbee effect due to spin charge tunneling conversion at the interface.

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Konstantin Denisov, Igor Rozhansky, Sergio Valenzuela, and Igor Zutic "Terahertz spin resonance of proximitized Dirac electrons", Proc. SPIE PC12656, Spintronics XVI, PC126560H (28 September 2023); https://doi.org/10.1117/12.2677566

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KEYWORDS

Electrons

Graphene

Magnetism

Spin polarization

Electric fields

Heterojunctions

Interfaces

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