Inelastic electron-electron scattering for surface states on Cu(110) and Ag(110)

Tsirkin, Stepan S.; Eremeev, S. V.; Chulkov, Eugene V.

doi:10.1103/physrevb.84.115451

Cited by 15 publications

(8 citation statements)

References 61 publications

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“…Thus, the lifetime broadening due to the EEI should be ee = tot − ed − ep ∼ 9 meV at the Y point, which is significantly smaller than the broadening predicted by model calculations, ee = 21 meV (Ref. [43]). We note that an accurate experimental evaluation of the lifetime broadening contributes to the critical assessment and fundamental development of many-body theory.…”

Section: Resultsmentioning

confidence: 75%

Many-body interactions and Rashba splitting of the surface state on Cu(110)

et al. 2014

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Using high-resolution angle-resolved photoemission spectroscopy, we elucidate the Rashba splitting of k F = 0.003Å −1 near the Fermi level (E F ) in the Shockley surface state of Cu (110) at the Y point of the surface Brillouin zone. The observed energy-band dispersion exhibits a kink structure at ∼−20 meV, which is a clear indication of band renormalization caused by an electron-phonon interaction. The electron-phonon coupling parameter is found to be λ ep = 0.17 ± 0.02 based on the experimentally obtained real part of the self-energy. First-principle calculations yield λ ep = 0.160 and k F = 0.004Å −1 at E F , which are fully consistent with the experimental results. In addition, the contributions of the electron-electron and electron-phonon interactions to the linewidth of the surface state at the Y point are experimentally determined to be ee ∼ 9 meV and ep ∼ 7 meV, respectively. We demonstrate that the Rashba splitting must be resolved by photoemission line-shape analysis for an accurate determination of the electron self-energy and coupling parameters.

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Section: Resultsmentioning

confidence: 75%

Many-body interactions and Rashba splitting of the surface state on Cu(110)

et al. 2014

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“…1 ). Its electronic and non-linear optical properties have been characterized by static ARPES using 21.2-eV light [33], scanning tunneling spectroscopy [34,35], surface second harmonic spectroscopy (SSHG) [36], inverse photoemission [37,38], and many-body theory [39]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Towards full surface Brillouin zone mapping by coherent multi-photon photoemission

James

Wang

et al. 2020

New J. Phys.

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We report a novel approach for coherent multi-photon photoemission in the entire Brillouin zone with infrared light that is readily implemented in a laboratory setting. We excite a solid state material, Ag(110), with intense femtosecond laser pulses to excite higher-order multi-photon photoemission; angle-resolved electron spectroscopic acquisition records photoemission at large in-plane momenta involving optical transitions from the occupied to unoccupied bands of the sample that otherwise might remain hidden by the photoemission horizon. We propose this as a complementary ultrafast method to time- and angle-resolved two-color, e.g. infrared pump and extreme ultraviolet probe, photoemission spectroscopy, with the advantage of being able to measure and control the coherent electron dynamics.

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“…These features define the Ag(110) surface structure, which has made it an epitome for its anisotropic dielectric response to vectorial optical fields. 40−43 A further aspect of the anisotropy is that (110) surfaces convene two SS bands at their Y̅ points (Figure 1b) 91,105,128 such that the occupied one is localized in the atomic grooves, and the unoccupied other is elevated onto the ridges (see Figure 2 of ref 135). Dipole transitions between these SS bands enhance the nonlinear responses of the Ag( 110) surface (surface second harmonic generation 128 and four-photon photoemission), 105 but only when the applied optical field has a component in the [001] direction, i.e., orthogonal to the surface corrugation.…”

Section: ■ Discussionmentioning

confidence: 99%

“…In the k -space, the [110] direction vectors bisect pairs of proximate [111] vectors, locating (110) surfaces orthogonal to them at conjunctions of two (111) planes, from which they acquire ridges and grooves two atoms-wide that run in the [11̅0] or the Γ̅– X̅ direction. While in the [11̅0] direction the neighboring atoms are at the close-packing distance , , in the [001] direction the parallel ridge atomic rows are separated by a (Figure c). These features define the Ag(110) surface structure, which has made it an epitome for its anisotropic dielectric response to vectorial optical fields. − …”

Section: Discussionmentioning

confidence: 99%

Plasmonic Photoemission from Single-Crystalline Silver

Reutzel

Wang

et al. 2021

ACS Photonics

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Optical fields interacting with solids excite single particle quantum transitions and elicit collective screening responses that define their penetration, absorption, and reflection. The interplay of these interactions on the attosecond time scale defines how optical energy transforms to electronic, setting the limits of efficiency for processes such as solar energy harvesting or photocatalysis. Our understanding of light–matter interactions is primarily based on specifying the electronic structure of solids and initial particles or fields occupying well-defined states, and the outcome of their interaction culminating in photoelectron or photon emission and analysis, with scant ability to follow the transitional, ultrafast many-body interactions that define it. The optical properties of metals transubstantiate from metallic to dielectric when the real part of their dielectric response function, Re[ε(ω)], passes through zero: at low frequencies, Re[ε(ω)] < 0, and the collective free electron plasmonic response confers high reflectivity; at high frequencies, Re[ε(ω)] > 0, and the fields penetrate as charge-density or longitudinal plasmon waves. How such collective plasmonic responses decay on the femtosecond time scale into single particle excitations is cardinal to plasmonics, but not sufficiently well described by experiment or theory. We examine the spectroscopic signatures of the nonlinear single particle and collective excitations of the low index crystals of silver by nonlinear two-photon photoemission spectroscopy, at frequencies where the bulk dielectric response passes through zero. We find that the transition through zero dielectric region is reflected in the nonlinear photoemission spectra, and in particular, the bulk plasmons decay by giving rise to a non-Einsteinian plasmonic photoemission component. This response, where the energy of photoelectrons is not defined by the incoming photons, occurs when photons excite the longitudinal plasmons, which then decay by exciting photoelectrons selectively from the Fermi level. Such mode of plasmon decay into hot electrons is contrary to the general agreement, but confirms a theoretical prediction by J. J. Hopfield from 1965. Our experiment illuminates a more energy efficient optical-to-electronic energy flow in metals that so far has escaped scrutiny.

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Inelastic electron-electron scattering for surface states on Cu(110) and Ag(110)

Cited by 15 publications

References 61 publications

Many-body interactions and Rashba splitting of the surface state on Cu(110)

Many-body interactions and Rashba splitting of the surface state on Cu(110)

Towards full surface Brillouin zone mapping by coherent multi-photon photoemission

Plasmonic Photoemission from Single-Crystalline Silver

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