Nonlinear Plasmonic Photoelectron Response of Ag(111)

Reutzel, Marcel; Li, Andi; Gumhalter, B.; Petek, Hrvoje

doi:10.1103/physrevlett.123.017404

Cited by 48 publications

(71 citation statements)

References 75 publications

(109 reference statements)

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“…Thereby, higher-order mPP yield can be enhanced by resonant driving of selected dipole transitions [41], as well as by excitation at characteristic frequencies of the materials dielectric function, e.g. at the epsilon-near-zero condition, where the materials response is shown to be dominantly non-linear [17,56]. We thus anticipate that time-and angle-resolved photoemission data from such materials will become increasingly accessible in typical laser-based photoemission laboratories without having to resort to more complex XUV pulse generation.…”

Section: Discussionmentioning

confidence: 99%

“…Time-and angle-resolved two-photon photoemission spectroscopy (TR-2PP) enables mapping the energy and momentum (k||, k⊥)-resolved electronic structure and dynamics of the occupied and unoccupied electronic bands of solids [1][2][3]. Using excitation frequencies from the infrared (IR) to the ultraviolet (UV) range, TR-2PP has been applied to a wide range of condensed matter systems ranging from pristine metals to complex materials and interfaces [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In TR-2PP spectroscopy, the photon energies ℏ𝜔 of the pump and the probe laser pulses are chosen such that the pump excites the sample to a real or a virtual intermediate state and the probe induces further upward transition from the excited system to induce photoemission.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…2 for four different sample temperatures. In such plots: (1) the slope defines how many photons are necessary to coherently induce photoemission from a particular (initial or intermediate) state [86,87]; and (2) the intercept gives the energy from which the coherent excitation occurs. Because the slopes of such plots are ∼1, the temperature-dependent intercepts tell us that photoemission occurs by absorption of a single photon from a transiently populated intermediate e g state and gives the temperature dependence of its energy.…”

Section: Methodsmentioning

confidence: 99%

Electron-phonon coupling in d -electron solids: A temperature-dependent study of rutile TiO2 by first-principles theory and two-photon photoemission

Shang

Argondizzo

Tan

et al. 2019

Phys. Rev. Research

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is a paradigmatic transition-metal oxide with applications in optics, electronics, photocatalysis, etc., that are subject to pervasive electron-phonon interaction. To understand how energies of its electronic bands, and in general semiconductors or metals where the frontier orbitals have a strong d-band character, depend on temperature, we perform a comprehensive theoretical and experimental study of the effects of electron-phonon (e-p) interactions. In a two-photon photoemission (2PP) spectroscopy study we observe an unusual temperature dependence of electronic band energies within the conduction band of reduced rutile TiO 2 , which is contrary to the well-understood sp-band semiconductors and points to a so far unexplained dichotomy in how the e-p interactions affect differently the materials where the frontier orbitals are derived from the sp-and d orbitals. To develop a broadly applicable model, we employ state-of-the-art first-principles calculations that explain how phonons promote interactions between the Ti-3d orbitals of the conduction band within the octahedral crystal field. The characteristic difference in e-p interactions experienced by the Ti-3d orbitals of rutile TiO 2 crystal lattice are contrasted with the more familiar behavior of the Si-2s orbitals of stishovite SiO 2 polymorph, in which the frontier 2s orbital experiences a similar crystal field with the opposite effect. The findings of this analysis of how e-p interactions affect the d-and sp-orbital derived bands can be generally applied to related materials in a crystal field. The calculated temperature dependence of d-orbital derived band energies agrees well with and explains the temperature-dependent inter-d-band transitions recorded in 2PP spectroscopy of TiO 2. The general understanding of how e-p interactions affect d-orbital derived bands is likely to impact the understanding of temperature-dependent properties of highly correlated materials.

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“…In recent years, the so-called epsilon-near-zero (ENZ) materials, with a spectral region where the real part of the permittivity crosses zero, have emerged as one of the most promising platforms for all-optical switching. Naturally occurring homogeneous ENZ material comprises metals [1][2][3][4] and semiconductors [5][6][7], and ENZ regions may also be engineered with metamaterials [8][9][10][11][12][13][14][15][16]. They have been shown to exhibit exotic behaviors such as photon tunneling [10,[16][17][18], highly directional radiation [19][20][21], cloaking [22], and perfect absorption [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Understanding all-optical switching at the epsilon-near-zero point: a tutorial review

et al. 2022

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Epsilon-near-zero (ENZ) materials that operate in the spectral region where the real part of the permittivity crosses zero have recently emerged as a promising platform for all-optical switching because of the large, optically induced reflectance and transmittance modulation they offer at ultrafast speeds. To gain insights into the ENZ modulation, this study focuses on the reflectance and transmittance modulation of commonly used ENZ switching schemes and applies an analytical framework both for intraband and interband pumping. We consider the effects of the wavelength, the angle, and the probe polarization on the modulation amplitude for different configurations, specifically highlighting the locations of the maximum reflectance/ transmittance modulation and the maximum refractive index modulation, which often occur at different wavelengths around the ENZ point. We find that the maximum modulation, while proximal to the ENZ point, can occur away from the ENZ point and even slight deviations can result in seemingly anomalous modulation behavior. The occurrence of resonances at the ENZ region for ultrathin films further increases the modulation strength. This work paves the path for practical and effective all-optical modulation approaches employing ENZ materials, and will help design the best experimental configurations for future material studies and nonlinear optical experiments employing ENZ materials.

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Nonlinear Plasmonic Photoelectron Response of Ag(111)

Cited by 48 publications

References 75 publications

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

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

Electron-phonon coupling in d -electron solids: A temperature-dependent study of rutile TiO2 by first-principles theory and two-photon photoemission

Understanding all-optical switching at the epsilon-near-zero point: a tutorial review

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