Attosecond chronoscopy of the photoemission near a bandgap of a single-element layered dielectric-Reference-Cited by-同舟云学术

Attosecond chronoscopy of the photoemission near a bandgap of a single-element layered dielectric

Published:2024-06-28 Issue:26 Volume:10 Page:
ISSN:2375-2548
Container-title:Science Advances
language:en
Short-container-title:Sci. Adv.

Author:

Potamianos Dionysios¹^ORCID,Schnitzenbaumer Maximilian¹,Lemell Christoph²^ORCID,Scigalla Pascal¹^ORCID,Libisch Florian²^ORCID,Schock-Schmidtke Eckhard¹^ORCID,Haimerl Michael¹,Schröder Christian¹,Schäffer Martin¹^ORCID,Küchle Johannes T.¹,Riemensberger Johann³^ORCID,Eberle Karl¹,Cui Yang⁴⁵^ORCID,Kleineberg Ulf⁴⁵,Burgdörfer Joachim²,Barth Johannes V.¹,Feulner Peter¹,Allegretti Francesco¹^ORCID,Kienberger Reinhard¹^ORCID

Affiliation:

1. Physik Department, Technische Universität München, Garching, 85748, Germany.

2. Institute for Theoretical Physics, Vienna University of Technology, Vienna, 1040, Austria.

3. Laboratory of Photonics and Quantum Measurements, École Polytechnique Fédérale de Lausanne, Lausanne, CH-1015, Switzerland.

4. Max-Planck Institut für Quantenoptik, Garching, 85748, Germany.

5. Fakultät für Physik, Ludwig-Maximilians-Universität München, Garching, 85748, Germany.

Abstract

We report on the energy dependence of the photoemission time delay from the single-element layered dielectric HOPG (highly oriented pyrolytic graphite). This system offers the unique opportunity to directly observe the Eisenbud-Wigner-Smith (EWS) time delays related to the bulk electronic band structure without being strongly perturbed by ubiquitous effects of transport, screening, and multiple scattering. We find the experimental streaking time shifts to be sensitive to the modulation of the density of states in the high-energy region ( E ≈ 100 eV) of the band structure. The present attosecond chronoscopy experiments reveal an energy-dependent increase of the photoemission time delay when the final state energy of the excited electrons lies in the vicinity of the bandgap providing information difficult to access by conventional spectroscopy. Accompanying simulations further corroborate our interpretation.

Publisher

American Association for the Advancement of Science (AAAS)

Link

https://www.science.org/doi/pdf/10.1126/sciadv.ado0073

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