Metal surface induces strong acoustic plasmons in chemically doped graphene
arXiv:1907.02806 · doi:10.1103/PhysRevB.100.195401
Abstract
Recent theoretical considerations have demonstrated that freestanding graphene doped with alkali metals (AC x ) supports strong Dirac and weak acoustic plasmons. Here we show that when AC x is deposited on a metallic surface, the intense Coulomb screening completely washes out these collective modes. However, even small increase of separation between AC x and metallic surface causes recovery of AC x plasmonic properties and especially the enhancement of acoustic plasmons intensities not present in the freestanding case. We further provide the physical background of these intriguing phenomena. The studied systems consist of lithium- and cesium-doped graphene deposited on Ir(111) surface.
References in corpus (23)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Advanced capabilities for materials modelling with Quantum ESPRESSO
- Plasmonics in graphene at infra-red frequencies
- Dielectric function, screening, and plasmons in 2D graphene
- Graphene Plasmonics for Terahertz to Mid-Infrared Applications
- Mid-Infrared Plasmonic Biosensing with Graphene
- Dynamical polarization of graphene at finite doping
- Probing the Ultimate Plasmon Confinement Limits with a Van der Waals heterostructure
- Tuning quantum non-local effects in graphene plasmonics
- Graphene on Ir(111): Physisorption with chemical modulation
- The mechanism of caesium intercalation of graphene
- Graphene-plasmon polaritons: From fundamental properties to potential applications
- van der Waals density functionals built upon the electron-gas tradition: Facing the challenge of competing interactions
- Novel low-energy collective excitation at metal surfaces
- Interpretation of van der Waals density functionals
- Theory of acoustic surface plasmons
- Acoustic plasmons in extrinsic free-standing graphene
- Electronic excitations in quasi-2D crystals: What theoretical quantities are relevant to experiment?
- Confining graphene plasmons to the ultimate limit
- Dopant-induced plasmon decay in graphene
- Quantum Effects in the Acoustic Plasmons of Atomically-Thin Heterostructures
- Strong two-dimensional plasmon in Li-intercalated hexagonal boron-nitride film with low damping
- UV active plasmons in alkali and alkaline earth intercalated graphene