Optical N-plasmon: topological hydrodynamic excitations in graphene from repulsive Hall viscosity

Sun, Wenbo; Van Mechelen, Todd; Bharadwaj, Sathwik; Boddeti, Ashwin K.; Jacob, Zubin

doi:10.1088/1367-2630/ad04bc

Title: Optical N-plasmon: topological hydrodynamic excitations in graphene from repulsive Hall viscosity

Journal Article · Wed Nov 08 00:00:00 EST 2023 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/ad04bc· OSTI ID:2205250

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Abstract Edge states occurring in Chern and quantum spin-Hall phases are signatures of the topological electronic band structure in two-dimensional (2D) materials. Recently, a new topological electromagnetic phase of graphene characterized by the optical N-invariant was proposed. Optical N-invariant arises from repulsive Hall viscosity in hydrodynamic many-body electron systems, distinct from the Chern and Z ₂ invariants. In this paper, we introduce the topologically protected edge excitation—optical N-plasmon of interacting many-body electron systems in the topological optical N-phase. These optical N-plasmons are signatures of the topological plasmonic band structure in 2D materials. We demonstrate that optical N-plasmons exhibit unique dispersion relations, stability against various boundary conditions, and edge profiles when compared with the topologically trivial edge magneto plasmons. Based on the optical N-plasmon, we design an ultra sub-wavelength broadband topological hydrodynamic circulator, which is a chiral quantum radio-frequency circuit component crucial for information routing and interfacing quantum–classical computing systems. Furthermore, we reveal that optical N-plasmons can be effectively tuned by the neighboring dielectric environment without breaking the topological properties. Our work provides a smoking gun signature of topological electromagnetic phases occurring in 2D materials arising from repulsive Hall viscosity.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0017717

OSTI ID:: 2205250

Alternate ID(s):: OSTI ID: 2202877

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Vol. 25 Journal Issue: 11; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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