Long-lived domain wall plasmons in gapped bilayer graphene

Abstract

Topological domain walls in dual-gated gapped bilayer graphene host edge states that are gate- tunable and valley polarized. Here we predict that plasmonic collective modes can propagate along these topological domain walls even at zero bulk density, and possess a markedly different character from that of bulk plasmons. Strikingly, domain wall plasmons are extremely long-lived, with plasmon lifetimes that can be orders of magnitude larger than the transport scattering time in the bulk. While most pronounced at low temperatures, long domain wall plasmon lifetimes persist even at room temperature with values up to a few picoseconds. Domain wall plasmons possess a rich phenomenology including a wide range of frequencies (up to the mid-infrared), tunable sub-wavelength electro-magnetic confinement lengths, as well as a valley polarization for forward/backward propagating modes. Its unusual features render them a new tool for realizing low-dissipation plasmonics that transcend the restrictions of the bulk.

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• Tailored nano-electronics and photonics with two-dimensional materials at terahertz frequencies
• Dual-gated graphene devices for near-field nano-imaging
• Edge modes and Fabry-Perot Plasmonic Resonances in anomalous-Hall Thin Films
• Plasma solitons in gated two-dimensional electron systems: exactly solvable analytical model for the regime beyond weak non-linearity
• Giant resonant skew scattering of plasma waves in a two-dimensional electron gas
• Local Optical Conductivity of Bilayer Graphene with Kink Potential
• Twisted bilayer graphene as a terahertz plasmonic crystal