Plasmaron excitations in p(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mo>×</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>)-K/graphite

Chiş, Vasile; Silkin, Viatcheslav M.; Hellsing, B.

doi:10.1103/physrevb.89.205429

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…Here the vertex encompassing one incoming and one outgoing red electron line and one wavy plasmon line can be identified with the plasmaron vertex. 59 Note that the two-hole state |polarization ′′ in ( 9) is mapped in the appearance of two hole dashed lines in Fig. 6(c).…”

Section: Cmentioning

confidence: 97%

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Plasmonically assisted channels of photoemission from metals

Novko,

Despoja,

Reutzel

et al. 2021

Preprint

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We analyse recently measured nonlinear photoemission spectra from Ag surfaces that reveal resonances whose energies do not scale with the applied photon energy but stay pinned to multiples of bulk plasmon energy ωp above the Fermi level. To elucidate these unexpected and peculiar features we investigate the spectra of plasmons generated in a solid by the optically pumped electronic polarization and their effect on photoemission. By combining quadratic response formalism for calculations of photoemission yield, a nonperturbative approach to inelastic electron scattering, and first-principles calculations for the electronic structure, we demonstrate the dependence of probability amplitude for single-and multiplasmon excitations on the basic parameters characterizing the photon pulse and the system. The resulting multiexcitation spectrum evolves towards a truncated plasmonic coherent state. Analogous concept is extrapolated to interpret plasmon generation by multiphoton excited electronic polarization. Based on this we elaborate a scenario that the thus created real plasmons act as supplementary frequency-locked pump field for non-Einsteinian plasmonically assisted channels of photoemission from metals. The established paradigm enables assignment and assessment of the observed linear ωp-and nonlinear 2 ωp-electron yields from Ag. Such effects may be exploited for selective filtering of optical energy conversion in electronic systems.

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Section: Cmentioning

confidence: 97%

“…The coupled photoexcited electron-plasmon entity is usually termed plasmonic polaron or plasmaron. 58,59 The electron component on the RHS of ( 19),viz.…”

Section: S(✟)mentioning

confidence: 99%

Plasmonically assisted channels of photoemission from metals

Novko,

Despoja,

Reutzel

et al. 2021

Preprint

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“…This enables a possibility to distinguish extrinsic from intrinsic plasmarons, where the latter is generated by the photo-hole. Following up a previous theoretical study of the system p(2×2)-K/Graphite [23] shows that this prediction seems reliable.…”

Section: Discussionmentioning

confidence: 99%

“…We have previously calculated the surface loss function, Im [g(q , ω)] within the Time Dependent Density Functional Theory scheme [23]. The surface loss function versus ω and q reveals a linear sound-like dispersion collective excitation in the energy range 0-0.6 eV with a momentum transfer span up to about 0.1 a.u.…”

Section: Acoustic Surface Plasmonsmentioning

confidence: 99%

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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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