Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon–phonon hybridization

Marinković, Tijana; Radović, Ivan; Borka, D.; Mišković, Z. L.

doi:10.1016/j.physleta.2014.11.044

Cited by 11 publications

(10 citation statements)

References 33 publications

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“…is the background dielectric function due to the substrate [63] described by a frequency-dependent dielectric function ε s (u) which is modeled in the local approximation (i.e., by neglecting spatial dispersion in the substrate) as a set of DrudeeLorentz oscillators,…”

Section: Theoretical Modelmentioning

confidence: 99%

Interband plasmons in supported graphene on metal substrates: Theory and experiments

Politano

Radović

Borka

et al. 2016

Carbon

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Section: Theoretical Modelmentioning

confidence: 99%

Interband plasmons in supported graphene on metal substrates: Theory and experiments

Politano

Radović

Borka

et al. 2016

Carbon

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“…Gray (red) dashed lines mark the curves ω=0.5v F q, ω=2v F q, and ω=4v F q q c , and hence, it may also be accessed by the resonance condition for the lower speed of v=0.5v F , which falls in the subthreshold region of projectile speeds, v<v F . It was shown recently that this phonon branch survives Landau damping in the intra-band SPEs region and gives rise to a subthreshold wake effect due to plasmon-phonon hybridization in the graphene/SiO 2 system [42].…”

Section: Resultsmentioning

confidence: 97%

“…We have recently shown that the narrow localization of the wake pattern seen in Fig. 2b due to the plasmon-phonon hybrid mode may give rise to strong directionality in the interactions between two slow charges, which move over supported graphene at a finite distance from each other [42].…”

Section: Resultsmentioning

confidence: 99%

Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles

et al. 2015

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We use the dielectric response formalism to show how an incident charged particle may be used to probe the hybridization taking place between the Dirac plasmon in graphene and the surface optical phonon modes in a SiO 2 substrate. Strong effects of this hybridization are found in the wake pattern in the induced potential, as well as in the stopping and image forces that act on the incident charge in a broad range of its velocities. Particularly intriguing is the possibility to control the plasmon-phonon hybridization by varying the doping density of graphene, where the regime of a nominally neutral graphene is expected to give rise to dramatic effects in the energy loss of charged particles that move at the velocities below the Fermi velocity of graphene.

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“…In the nanoscale devices, graphene layers typically appear in stacks [12,15] or sandwichlike structures [16] with insulating spacers between them made of polar materials, which often support strong Fuchs-Kliewer (FK), or surface optical phonon modes in the THz to mid-IR frequency range [17]. Those surface phonons strongly interact with longitudinal plasmon modes, and may therefore completely change the dispersion and damping of the Dirac plasmons in graphene [18][19][20][21], thereby seriously affecting its tunability for optoelectronic [12,17,[20][21][22] and plasmonic [23][24][25] applications in the range of frequencies of technological interest. While this provides strong motivation for a theoretical study of plasmon-phonon hybridization between graphene and the nearby polar insulator(s), a question arises as to how one can most effectively probe the hybridized plasmon-phonon modes.…”

Section: Introductionmentioning

confidence: 99%

“…Similar theoretical investigations were already conducted in Refs. [18,19], where the authors investigated hybridized plasmon-phonon modes in single-layer graphene deposited on an (experimentally often used) SiO 2 semi-infinite substrate.…”

Section: Introductionmentioning

confidence: 99%

Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system

et al. 2017

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The propagator of a dynamically screened Coulomb interaction W in a sandwichlike structure consisting of two graphene layers separated by a slab of Al 2 O 3 (or vacuum) is derived from single-layer graphene response functions and by using a local dielectric function for the bulk Al 2 O 3. The response function of graphene is obtained using two approaches within the random phase approximation (RPA): an ab initio method that includes all electronic bands in graphene and a computationally less demanding method based on the massless Dirac fermion (MDF) approximation for the low-energy excitations of electrons in the π bands. The propagator W is used to derive an expression for the effective dielectric function of our sandwich structure, which is relevant for the reflection electron energy loss spectroscopy of its surface. Focusing on the range of frequencies from THz to mid-infrared, special attention is paid to finding an accurate optical limit in the ab initio method, where the response function is expressed in terms of a frequency-dependent conductivity of graphene. It was shown that the optical limit suffices for describing hybridization between the Dirac plasmons in graphene layers and the Fuchs-Kliewer phonons in both surfaces of the Al 2 O 3 slab, and that the spectra obtained from both the ab initio method and the MDF approximation in the optical limit agree perfectly well for wave numbers up to about 0.1 nm −1. Going beyond the optical limit, the agreement between the full ab initio method and the MDF approximation was found to extend to wave numbers up to about 0.3 nm −1 for doped graphene layers with the Fermi energy of 0.2 eV.

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Wake effect in the interaction of slow correlated charges with supported graphene due to plasmon–phonon hybridization

Cited by 11 publications

References 33 publications

Interband plasmons in supported graphene on metal substrates: Theory and experiments

Interband plasmons in supported graphene on metal substrates: Theory and experiments

Probing the Plasmon-Phonon Hybridization in Supported Graphene by Externally Moving Charged Particles

Ab initio study of the electron energy loss function in a graphene-sapphire-graphene composite system

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