Probing dielectric-response effects with attosecond time-resolved streaked photoelectron spectroscopy of metal surfaces

Zhang, Changhua; Thumm, Uwe

doi:10.1103/physreva.84.063403

Cited by 18 publications

(10 citation statements)

References 39 publications

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“…This yields an additional delay, since the normal field component is screened over very short depths (in the range 0–0.3 nm for Mg (ref. 31 )) at the surface, meaning that photoemitted electrons do not experience the streaking field until they reach the surface—which typically takes on the order of tens to hundreds of attoseconds 30 32 33 34 . In our case, however, photoelectrons from the nanotaper probe the electric field component parallel to the surface.…”

Section: Discussionmentioning

confidence: 99%

Attosecond nanoscale near-field sampling

et al. 2016

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The promise of ultrafast light-field-driven electronic nanocircuits has stimulated the development of the new research field of attosecond nanophysics. An essential prerequisite for advancing this new area is the ability to characterize optical near fields from light interaction with nanostructures, with sub-cycle resolution. Here we experimentally demonstrate attosecond near-field retrieval for a tapered gold nanowire. By comparison of the results to those obtained from noble gas experiments and trajectory simulations, the spectral response of the nanotaper near field arising from laser excitation can be extracted.

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Section: Discussionmentioning

confidence: 99%

Attosecond nanoscale near-field sampling

et al. 2016

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“…(2.13)]. The one-electron photoelectron spectrum , thus, includes a multitude of many-body effects (Zhang and Thumm, 2011b;Echenique et al, 1981) such as corehole screening (Canright, 1988;Huber et al, 2001) and relaxation, particle-hole and plasmon excitation. To identify and disentangle those processes, an alternative "three-step-model" (or "multi-step-model") of photoemission (Feibelman and Eastman, 1974) is frequently employed in which the response of the full many-body state |Ψ ( −1) ⟩ is reduced to few active degrees of freedom with which the outgoing photoelectron interacts.…”

Section: Time-resolved Photoemission From Surfacesmentioning

confidence: 99%

Attosecond chronoscopy of photoemission

2015

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Recent advances in the generation of well characterized sub-femtosecond laser pulses have opened up unpredicted opportunities for the real-time observation of ultrafast electronic dynamics in matter. Such attosecond chronoscopy allows a novel look at a wide range of fundamental photophysical and photochemical processes in the time domain, including Auger and autoionization processes, photoemission from atoms, molecules, and surfaces, complementing conventional energy-domain spectroscopy. Attosecond chronoscopy raises fundamental conceptual and theoretical questions as which novel information becomes accessible and which dynamical processes can be controlled and steered. These questions are currently a matter of lively debate which we address in this review. We will focus on one prototypical case, the chronoscopy of the photoelectric effect by attosecond streaking. Is photoionization instantaneous or is there a finite response time of the electronic wavefunction to the photoabsorption event? Answers to this question turn out to be far more complex and multi-faceted than initially thought. They touch upon fundamental issues of time and time delay as observables in quantum theory. We review recent progress of our understanding of time-resolved photoemission from atoms, molecules, and solids. We will highlight the unresolved and open questions and we point to future directions aiming at the observation and control of electronic motion in more complex nanoscale structures and in condensed matter.

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“…The feasibility of investigating photoemission in condensed matter with attosecond resolution, and the significant time delay observed in the first proof-of-principle experiment on W(110), prompted several theoretical studies of the phenomenon [15][16][17][18][19][20][21]. In the absence of a first-principles description, which is very challenging, one had to resort to simplified approaches that yielded quite contradictory predictions.…”

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Attosecond Time-Resolved Photoemission from Core and Valence States of Magnesium

et al. 2012

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We report on laser-assisted attosecond photoemission from single-crystalline magnesium. In strong contrast to the previously investigated transition metal tungsten, photoelectron wave packets originating from the localized core level and delocalized valence-band states are launched simultaneously from the solid within the experimental uncertainty of 20 as. This phenomenon is shown to be compatible with a heuristic model based on free-particle-like propagation of the electron wave packets generated inside the crystal by the attosecond excitation pulse and their subsequent interaction with the assisting laser field at the metal-vacuum interface.

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Probing dielectric-response effects with attosecond time-resolved streaked photoelectron spectroscopy of metal surfaces

Cited by 18 publications

References 39 publications

Attosecond nanoscale near-field sampling

Attosecond nanoscale near-field sampling

Attosecond chronoscopy of photoemission

Attosecond Time-Resolved Photoemission from Core and Valence States of Magnesium

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