Plasmon losses due to electron-phonon scattering: the case of graphene encapsulated in hexagonal Boron Nitride

Abstract

Graphene sheets encapsulated between hexagonal Boron Nitride (hBN) slabs display superb electronic properties due to very limited scattering from extrinsic disorder sources such as Coulomb impurities and corrugations. Such samples are therefore expected to be ideal platforms for highly-tunable low-loss plasmonics in a wide spectral range. In this Article we present a theory of collective electron density oscillations in a graphene sheet encapsulated between two hBN semi-infinite slabs (hBN/G/hBN). Graphene plasmons hybridize with hBN optical phonons forming hybrid plasmon-phonon (HPP) modes. We focus on scattering of these modes against graphene's acoustic phonons and hBN optical phonons, two sources of scattering that are expected to play a key role in hBN/G/hBN stacks. We find that at room temperature the scattering against graphene's acoustic phonons is the dominant limiting factor for hBN/G/hBN stacks, yielding theoretical inverse damping ratios of hybrid plasmon-phonon modes of the order of $50$-$60$, with a weak dependence on carrier density and a strong dependence on illumination frequency. We confirm that the plasmon lifetime is not directly correlated with the mobility: in fact, it can be anti-correlated.

14 pages, 4 figures

References in corpus (27)

• The electronic properties of graphene
• Boron nitride substrates for high-quality graphene electronics
• Graphene plasmonics
• Dielectric function, screening, and plasmons in 2D graphene
• Graphene Plasmonics for Terahertz to Mid-Infrared Applications
• STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
• Graphene Plasmonics: Challenges and Opportunities
• Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
• Dynamical polarization of graphene at finite doping
• Graphene field effect transistors as room-temperature Terahertz detectors
• Mid-infrared plasmons in scaled graphene nanostructures
• Acoustic phonon scattering limited carrier mobility in 2D extrinsic graphene
• Electronic transport in graphene: A semi-classical approach including midgap states
• Singular-phase nanooptics: towards label-free single molecule detection
• Strong Coulomb drag and broken symmetry in double-layer graphene
• Interaction phenomena in graphene seen through quantum capacitance
• The Role of Electron-electron Interactions in Graphene ARPES Spectra
• Electron-phonon heat transfer in monolayer and bilayer graphene
• Electron-Phonon Interactions and the Intrinsic Electrical Resistivity of Graphene
• Plasmon-phonon coupling in graphene
• Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
• Voltage and temperature dependencies of conductivity in gated graphene
• Phase Resolved Surface Plasmon Interferometry of Graphene
• Phonon-limited resistivity of graphene by first-principle calculations: electron-phonon interactions, strain-induced gauge field and Boltzmann equation
• Strong phonon-plasmon coupled modes in the graphene/silicon carbide heterosystem
• Linear response of doped graphene sheets to vector potentials
• Coulomb drag in graphene - boron nitride heterostructures: the effect of virtual phonon exchange

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