Photoemission by screened photon fields from layered solids

Samuelsen, D.; Schattke, W.

doi:10.1016/0039-6028(94)00835-3

Cited by 11 publications

(3 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although angle-resolved photoemission records energy and momentum distributions of single electrons [33], it also communicates on the many-body responses. For example, when photons suddenly expose Coulomb fields [7,[34][35][36], the screening response causes plasmon satellites to decorate the main photoemission peaks [33]. Time resolving the primary photoemission and its collective echoes, however, requires attosecond time resolution [37].…”

mentioning

confidence: 99%

Nonlinear Plasmonic Photoelectron Response of Ag(111)

Reutzel

Gumhalter

et al. 2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

Photons can excite the collective and single-particle excitations in metals; the collective plasmonic excitations are of keen interest in physics, chemistry, optics, and nanotechnology because they enhance coupling of the electromagnetic energy and can drive nonlinear processes in electronic materials, particularly where their dielectric function ε(ω) approaches zero. We investigate the nonlinear angle-resolved two-photon photoemission (2PP) spectroscopy of Ag(111) surface through the ε(ω) near-zero region. In addition to the Einsteinian single-particle photoemission, the 2PP spectra report unequivocal signatures of nonlocal dielectric, plasmonically enhanced, excitation processes.

show abstract

mentioning

confidence: 99%

Nonlinear Plasmonic Photoelectron Response of Ag(111)

Reutzel

Gumhalter

et al. 2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…One common procedure to meet these difficulties is to employ eigenstates of different Hamiltonians for the initial localized and final extended states, and to work on the p ជ •A ជ scheme of the matrix elements. 5,9,25,28 To apply our quasilocal pseudopotential coefficients, the method proposed by Pendry 14 has to be generalized. For this purpose, the matrix equation …”

Section: Application To Tisementioning

confidence: 99%

Nonlocal pseudopotentials in complex band-structure and photoemission calculations

Bödicker

Schattke

1997

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

Based on a recently proposed localization procedure, a nonlocal pseudopotential scheme is derived to calculate potential coefficients V G ជ G ជ Ј (k ជ ) which can be decomposed into terms, each being quadratic in k ជ and multiplied by a function of (G ជ ϪG ជ Ј), thus making them applicable to some important cases where local potential coefficients are required. Electronic structure calculations for semiconductors are in agreement with well-known semiempirical local pseudopotential band structures, as shown for GaAs. Nevertheless, the potential may significantly deviate from the semiempirical results. In order to test wave functions and transition probabilities, we prove the success of the procedure in a more troublesome case, i.e., applying it to a transitionmetal compound as the experimentally well-investigated layered crystal TiSe 2 , which up to now was not treated with a pseudopotential. Photoemission spectra within the one-step model are presented using Pendry's method of complex band-structure calculation. The latter formalism had to be slightly generalized for the quasilocal properties of the potential. The agreement of the spectra with experimental data shows this method to be a reliable and practical tool to use nonlocal pseudopotentials for conduction-band wave functions of electron spectroscopies.

show abstract

“…10 Several approximations of the surface region have been published in an attempt to model the most important part of the response of the system. Some use the hydrodynamic model 1,[11][12][13] and others use microscopic calculations [14][15][16] in which the photon field is screened with the same potential step as the one used to obtain the electronic wave functions.…”

Section: Introductionmentioning

confidence: 99%

Screening of the Photon Field in Surface Photoemission From Simple Metals

et al. 2000

View full text Add to dashboard Cite

A previous two-step hydrodynamic model calculation of angle-resolved photoemission has been improved by modeling the surface with a soft analytic function. The same ground-state potential is used to screen the photon field and to calculate the electronic wave functions. The implemented code can be used for arbitrary ground state densities along the perpendicular direction. Mathematical and physical aspects of the model are discussed extensively. The behavior of the main peak of the spectrum in response to the variation of some parameters leads us to the conclusion that the peak cannot be interpreted as the direct excitation of multipole modes. This conclusion was suggested in the previous two-step model calculation.

show abstract

Photoemission by screened photon fields from layered solids

Cited by 11 publications

References 19 publications

Nonlinear Plasmonic Photoelectron Response of Ag(111)

Nonlinear Plasmonic Photoelectron Response of Ag(111)

Nonlocal pseudopotentials in complex band-structure and photoemission calculations

Screening of the Photon Field in Surface Photoemission From Simple Metals

Contact Info

Product

Resources

About