Nonreciprocal electron hydrodynamics under magnetic fields: applications to nonreciprocal surface magnetoplasmons

• Main Authors: Sano, Ryotaro, Toshio, Riki, Kawakami, Norio
• Format: Journal Article
• Language: English
• Published: 17-07-2021
• Subjects: Physics - Mesoscale and Nanoscale Physics; Physics - Strongly Correlated Electrons
• DOI: 10.48550/arxiv.2105.08074

Phys. Rev. B 104, L241106 (2021) Recent experiments have elucidated that novel nonequilibrium states inherent
in the so-called hydrodynamic regime are realized in ultrapure metals with
sufficiently strong momentum-conserving scattering. In this letter, we
formulate a theory of electron hydrodynamics with broken inversion symmetry
under magnetic fields and find that novel terms emerge in hydrodynamic
equations which play a crucial role for the realization of the nonreciprocal
responses. Specifically, we clarify that there exist a novel type of
nonreciprocal collective modes dubbed nonreciprocal surface magnetoplasmons
arising from an interplay between magnetic fields and the orbital magnetic
moment. We reveal that these nonreciprocal collective modes indeed give rise to
the nonreciprocity in magneto-optical responses such as the reflectivity. The
physics discussed here will bridge the two important notions of
magnetoplasmonics and nonreciprocity in electron hydrodynamic materials with
inversion symmetry breaking and magnetic fields.