Plasmons in One and Two Dimensions

Pfnür, H.; Tegenkamp, Christoph; Vattuone, L.

doi:10.1007/978-3-030-46906-1_19

Cited by 5 publications

(8 citation statements)

References 112 publications

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“…18,19 Their short wavelength opens possibilities for their use as waveguides and for deposition of energy on the scale of a few nanometers. 19,20 With their typical frequencies from the terahertz to the near-infrared range, plasmonic excitations are inherently sensitive to external fields and surrounding media, which is highly desirable for atomic-scale sensor technology. The substrate−wire interaction is an additional parameter that can be used to modify plasma frequencies, e.g., by the use of distinct adsorbates and terraced substrates of different step densities.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Switching to 1D wire plasmons with their already built-in directionality of energy transport, the dispersion, according to theory, is intrinsically quasi-linear, since it starts at long wavelengths as E ∼ k ∥ ln k ∥ . The tunability of plasma frequencies as well as of their quasi-linear dispersion makes atomic wires attractive for novel electric circuits on the atomic scale. , Their short wavelength opens possibilities for their use as waveguides and for deposition of energy on the scale of a few nanometers. , With their typical frequencies from the terahertz to the near-infrared range, plasmonic excitations are inherently sensitive to external fields and surrounding media, which is highly desirable for atomic-scale sensor technology.…”

Section: Introductionmentioning

confidence: 99%

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Plasmon Localization by H-Induced Band Switching

Mamiyev

Sanna²,

Ziese³

et al. 2019

J. Phys. Chem. C

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The strong sensitivity of plasmonic excitations on nanostructures to their environment is studied, going to the ultimate limit of single atomic chains. As a first step, we investigated how metallicity in self-assembled arrays of Au chains on Si(557) is modified by the simplest possible adsorbate, namely, atomic hydrogen. Both experimental studies and ab initio simulations were carried out combining plasmon spectroscopy with atomistic first-principles density functional calculations (DFT). While metallicity, in general, is only distorted by H-induced disorder, we also observed band gap opening in the measured plasmon dispersion at large momenta, k ∥, that limits the plasmonic excitation to an energy of 0.43 eV in the presence of H. In the long-wavelength limit, disorder leads to plasmonic standing wave formation on short sections of wires and finite excitation energies for k ∥ → 0. DFT shows that Si surface bands strongly hybridize with those of Au so that H adsorption on the energetically most favorable sites at the Si step edge and the restatom chain not only causes a significant shift of bands but also strongly changes the character of hybridization. Together with H-induced changes in band order, this causes band gap opening and reduced overlap of wave functions. These mechanisms were identified as the main reasons for plasmon localization. Interestingly, although the whole electronic system is modified by H adsorption, there is no direct interaction between H and the Au chains.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasmon Localization by H-Induced Band Switching

Mamiyev

Sanna²,

Ziese³

et al. 2019

J. Phys. Chem. C

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“…First predicted by David Pines for a system with two types of electronic carriers with different Fermi velocities, ASPs correspond to low-energy collective electronic excitations with a soundlike dependence of the energy on the momentum. Their existence in metals was predicted and then demonstrated by high-resolution electron-energy loss spectroscopy (HREELS) for Be(0001) and later for Cu(111), , Au(111), Au(788), and supported graphene . Spin ASP has recently been demonstrated to contribute to the inelastic scattering of Ne off Ni(111) .…”

mentioning

confidence: 99%

“…Their existence in metals was predicted 18 and then demonstrated by high-resolution electron-energy loss spectroscopy (HREELS) for Be(0001) 19 and later for Cu(111), 20,21 Au(111), 22 Au(788), 23 and supported graphene. 24 Spin ASP has recently been demonstrated to contribute to the inelastic scattering of Ne off Ni(111). 25 However, the accessible energy range of thermal Ne atom scattering (NeAS) does not extend far beyond the vibrational spectrum, thus making it difficult to discern additional losses from phonon excitations, a limit which may be overcome using hyperthermal NeAS as in the present work.…”

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confidence: 99%

Prominence of Terahertz Acoustic Surface Plasmon Excitation in Gas–Surface Interaction with Metals

Bracco

Vattuone

Smerieri

et al. 2021

J. Phys. Chem. Lett.

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The current understanding of the dynamics of gas−surface interactions is that all of the energy lost in the collision is transferred to vibrations of the target. Electronic excitations were shown to play a marginal role except for cases in which the impinging particles have energies of several electronvolts. Here we show that this picture does not hold for metal surfaces supporting acoustic surface plasmons. Such loss, dressed with a vibronic structure, is shown to make up a prominent energy transfer route down to the terahertz region for Ne atoms scattering off Cu(111) and is expected to dominate for most metals. This mechanism determines, e.g., the drag force acting on telecommunication satellites, which are typically gold-plated to reduce overheating by sunshine. The electronic excitations can be unambiguously discerned from the vibrational ones under mild hyperthermal impact conditions.

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“…We predict that there are two prominent plasmonic branches present (outlined with black lines in Figure ). The stronger, higher-energy branch shows a dispersion relation in the low- q limit, consistent with a 2D plasmon excitation, − while the weaker plasmon branch shows an anisotropy between the Γ– X and Γ– Y directions with higher dispersion along Y . At lower energies (<1 eV), a branch with weaker magnitude appears along the Γ– Y direction.…”

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confidence: 83%

Microscopic Theory of Plasmons in Substrate-Supported Borophene

et al. 2020

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We compute the dielectric properties of freestanding and metal-supported borophene from first-principles time-dependent density functional theory. We find that both the low-and high-energy plasmons of borophene are fully quenched by the presence of a metallic substrate at borophene-metal distances smaller than 9Å. Based on these findings, we derive an electrodynamic model of the interacting, momentum-dependent polarizability for a two-dimensional metal on a model metallic substrate, which quantitatively captures the evolution of the dielectric properties of borophene as a function of metal-borophene distance. Applying this model to a series of metallic substrates, we show that maximizing the plasmon energy detuning between borophene and substrate is the key material descriptor for plasmonic performance.

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Plasmons in One and Two Dimensions

Cited by 5 publications

References 112 publications

Plasmon Localization by H-Induced Band Switching

Plasmon Localization by H-Induced Band Switching

Prominence of Terahertz Acoustic Surface Plasmon Excitation in Gas–Surface Interaction with Metals

Microscopic Theory of Plasmons in Substrate-Supported Borophene

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