One-step theory of photoelectron escape time: Attosecond spectroscopy of Mg(0001)

Kuzian, R. O.; Krasovskii, E. E.

doi:10.1103/physrevb.102.115116

Cited by 8 publications

(8 citation statements)

References 46 publications

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“…The semiclassical model is expected to be an adequate prediction of the photoemission delay time far from band gaps in the final state spectrum and when lattice scattering of the photoelectron wavepacket is weak [33]. Here we probe a region where this semiclassical approach is not applicable and contrast this model with a full one-step treatment in three dimensions [18]. Inspecting the final state band structure of W(110) for normal emission reveals that the dominating conducting branch splits into an "upper branch" and a "lower branch" around a final state energy of 100 eV (Fig.…”

Section: Discussionmentioning

confidence: 98%

Attosecond dynamics of photoemission over a wide photon energy range

Schröder,

Riemensberger,

Kuzian

et al. 2023

Preprint

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Dynamics of photoemission from surfaces are usually studied at low photon energies (<100 eV). Here, we report on new findings on these dynamics observed at a tungsten surface on the attosecond time scale at photon energies exceeding 100 eV, over a range of almost 50 eV. While photoemission, a fundamental process in quantum mechanics, is often described within a semiclassical three-step model, we find that even at high photon energies only a full quantum treatment in one step predicts the measured attosecond dynamics correctly. On this time scale the intuitive, mechanistic interpretation of the photoelectric effect breaks down. This underlines the necessity to further develop experimental and theoretical tools to be used in improving our understanding of the fundamental process of light-matter interaction underlying many methods in extreme ultraviolet and soft x-ray spectroscopy.

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Section: Discussionmentioning

confidence: 98%

Attosecond dynamics of photoemission over a wide photon energy range

Schröder,

Riemensberger,

Kuzian

et al. 2023

Preprint

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“…Modelling the XUV ionization in a solid is also not straightforward. While a more rigorous approach would require to describe the photoionization process in one step [214,215], a phenomenological approach which has been proven to be useful is based on a three step model [181], where the photoionization can be interpreted as composed by (figure 18) a first excitation of the photoelectron (step 1), which then moves from the solid to the surface (step 2) and finally is transmitted through the surface into the vacuum (step 3). Whether or not one model is sufficient to explain the experimental results depends on the target and the level of accuracy required.…”

Section: Tr-photoelectron Spectroscopy In Solidsmentioning

confidence: 99%

Attosecond spectroscopy for the investigation of ultrafast dynamics in atomic, molecular and solid-state physics

2022

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Since the ﬁrst demonstration of the generation of attosecond pulses (1 as = 10-18s) in the extreme-ultraviolet (XUV) spectral region, several measurement techniques have been introduced, at the beginning for the temporal characterization of the pulses, and immediately after for the investigation of electronic and nuclear ultrafast dynamics in atoms, molecules and solids with unprecedented temporal resolution. The attosecond spectroscopic tools established in the last two decades, together with the development of sophisticated theoretical methods for the interpretation of the experimental outcomes, allowed to unravel and investigate physical processes never observed before, such as the delay in photoemission from atoms and solids, the motion of electrons in molecules after prompt ionization which precede any notable nuclear motion, the temporal evolution of the tunneling process in dielectrics, and many others. This review focused on applications of attosecond techniques to the investigation of ultrafast processes in atoms, molecules and solids. Thanks to the introduction and ongoing developments of new spectroscopic techniques, the attosecond science is rapidly moving towards the investigation, understanding and control of coupled electron-nuclear dynamics in increasingly complex systems, with ever more accurate and complete investigation techniques. Here we will review the most common techniques presenting the latest results in atoms, molecules and solids.

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“…No experiment can distinguish between photoelectrons excited into different Bloch waves at the same energy and same k . This is especially obvious in the one-step theory of photoemission, in which the final state is represented by the time-reversed LEED state [3,17,21,22], so the photoemission matrix element is a coherent sum of the contributions from different Bloch waves, see a typical example in Fig. 2 below.…”

Section: Addendum: Critique Of the Authors' Responsementioning

confidence: 99%

“…(iii) When the PE mean free path (MFP) is small enough so the weight of the evanescent waves (complex Bloch vector k ⊥ ) in the surface region relevant for photoemision is comparable to that of the propagating wave(s) (real k ⊥ ). The ubiquity of the k -projected gaps and the multi-Bloch-wave character of Ψ pe is well documented for simple [3][4][5][6], noble and d-metals [7,8], layered dichalcogenides [9,10], etc. (see illustration in Fig.…”

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confidence: 99%