Oxygen vibrations and acoustic surface plasmon on Be(0001)

Jahn, Michael; Müller, Marcus; Endlich, M.; Néel, N.; Chiş, Vasile; Hellsing, B.

doi:10.1103/physrevb.86.085453

Cited by 21 publications

(19 citation statements)

References 49 publications

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“…Later on, electron-energy-loss spectroscopy experiments confirmed the presence of the ASP mode at the Be(0001) surface, in good agreement with first principles calculations [26], noble-metal surfaces [27][28][29][30][31], and graphene adsorbed on metal substrates [32][33][34]. In cases when surface-localized quantum-well states are formed, e.g., when atomic layers of alkali metals are adsorbed on a metal surface, the possibility opens up to design ASPs by varying the depth (type of alkali-metal atoms) and the width (number of layers) of the quantum well.…”

Section: Introductionsupporting

confidence: 72%

Plasmaron excitations in p(2×2)-K/graphite

2014

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Plasmarons formed by the compound of photoelectrons and acoustic surface-plasmon excitations is investigated in the system p(2 × 2)-K/graphite. The physics behind this type of plasmarons (e plasmarons) differs from the physics of plasmarons recently found in graphene, where the loss feature is argued to result from the photohole-plasmon interaction (h plasmarons). Based on first principles methods we calculate the dispersion of the e-plasmaron excitation rate, which yields a broad feature below the parabolic quantum-well band with a peak about 0.4 eV below the quantum-well band at the¯ point.

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Section: Introductionsupporting

confidence: 72%

Plasmaron excitations in p(2×2)-K/graphite

2014

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“…This is, in particular, the case for metal surfaces supporting an electronic Shockley surface state (SS) with band dispersion crossing the Fermi level [10]. Such a mode, called an acoustic surface plasmon (ASP), was observed, in addition to the conventional surface plasmons, for a variety of noble and simple metal surfaces [11][12][13][14][15]. Recently, a similar mode was reported also for graphene grown on a metallic substrate [16,17], providing the 2D and the 3D electron gases, respectively.…”

mentioning

confidence: 99%

Correlated Motion of Electrons on the Au(111) Surface: Anomalous Acoustic Surface-Plasmon Dispersion and Single-Particle Excitations

et al. 2013

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The linear dispersion of the low-dimensional acoustic surface plasmon (ASP) opens perspectives in energy conversion, transport, and confinement far below optical frequencies. Although the ASP exists in a wide class of materials, ranging from metal surfaces and ultrathin films to graphene and topological insulators, its properties are still largely unexplored. Taking Au(111) as a model system, our combined experimental and theoretical study revealed an intriguing interplay between collective and single particle excitations, causing the ASP associated with the Shockley surface state to be embedded within the intraband transitions without losing its sharp character and linear dispersion. DOI: 10.1103/PhysRevLett.110.127405 PACS numbers: 78.68.+m, 71.45.Gm, 79.20.Uv One of the most attractive aspects of plasmonics-an explosively growing interdisciplinary research field-is the ability to squeeze light into subwavelength regions thanks to the properties of surface plasmon polaritons (SPP) [1,2], an excitation resulting from the interaction of photons with surface plasmons [3]. In particular, light confinement (i.e., the ratio between the wavelength of the electromagnetic radiation and of the induced plasmonic excitation) in the plane parallel to the surface takes place because of the several times lower velocity of the SPP with respect to light, implying that at any given excitation frequency, the wavelength of the SPP is shortened by the same ratio.Even higher in-plane confinements can be achieved with plasmons associated with a two dimensional electronic gas, notably in graphene [4], since their dispersion is much flatter than that of SPP. The 2D plasmon energy ! 2DP varies as $ ffiffiffiffiffi q k p for small in-plane momentum q k with ! 2DP ! 0 as q k ! 0 [5], which allows for extraordinary light confinement from subterahertz to midinfrared frequencies by use of appropriate nanostructures providing the necessary momentum transfer.Recently, an in-plane confinement rate as high as 40 was attained in graphene sheets grown on a dielectric substrate [6,7]. An even higher value of $100 was achieved for graphene nanostructures [8], making use of the 2D plasmon supported by the 2D electron gas of doped graphene. However, the $ ffiffiffiffiffi q k p dispersion makes a distortionless propagation of nonmonochromatic signals inherently impossible, since the different frequencies components propagate at different velocities. This drawback can be overcome using a plasmon energy with a linear rather than a square root dispersion. The former is expected whenever a partially filled electronic 2D band is coupled and shielded by other 2D or 3D electron gases [9], and is thus a fairly general concept. This is, in particular, the case for metal surfaces supporting an electronic Shockley surface state (SS) with band dispersion crossing the Fermi level [10]. Such a mode, called an acoustic surface plasmon (ASP), was observed, in addition to the conventional surface plasmons, for a variety of noble and simple metal surfaces [11][12][...

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“…Later on Electron Energy Loss Spectroscopy experiments have confirmed the presence of the ASP mode at the Be(0001) [5,6] and noble metal surfaces [7][8][9][10][11][12][13][14] in good agreement with calculations and graphene adsorbed on metal substrates [15][16][17][18][19][20][21][22]. In cases when surface localized quantum well states are formed, e.g.…”

Section: Introductionmentioning

confidence: 53%

“…The calculated ARPES intensity according to Eq. (6) gives the extrinsic plasmaron excitations and is shown as function of parallel momentum and energy in Fig. 3.…”

Section: Plasmaron Excitationsmentioning

confidence: 99%

Photoemission footprints of extrinsic plasmarons

Hellsing¹,

Silkin²

2015

Phys. Rev. B

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A prediction how to experimentally distinguish excitations of extrinsic plasmarons from intrinsic plasmarons is presented. In surface systems where excitations of acoustic surface plasmons is possible it is shown that the photo-electron yield in normal photoemission should decay according to an inverse square root dependence with respect to the photon energy. A computational analysis of the system p(2×2)-K/Graphite confirms this prediction.

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Oxygen vibrations and acoustic surface plasmon on Be(0001)

Cited by 21 publications

References 49 publications

Plasmaron excitations in p(2×2)-K/graphite

Plasmaron excitations in p(2×2)-K/graphite

Correlated Motion of Electrons on the Au(111) Surface: Anomalous Acoustic Surface-Plasmon Dispersion and Single-Particle Excitations

Photoemission footprints of extrinsic plasmarons

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