Extreme ultraviolet transient absorption of solids from femtosecond to attosecond timescales Invited

Lauren J. Borja, M. Zürch, C. D. Pemmaraju, Martin Schultze, Krupa Ramasesha, Andrey Gandman, James S. Prell, David Prendergast, Daniel M. Neumark, Stephen R. Leone

Research output: Contribution to journalArticleResearchpeer-review

Abstract

High-harmonic generation (HHG) produces ultrashort pulses of extreme ultraviolet radiation (XUV), which can be used for pump--probe transient absorption spectroscopy in metal oxides, semiconductors, and dielectrics. Femtosecond transient absorption on iron and cobalt oxides identifies ligand-to-metal charge transfer as the main spectroscopic transition, rather than metal-to-metal charge transfer or d--d transitions, upon photoexcitation in the visible. In silicon, attosecond transient absorption reveals that electrons tunnel into the conduction band from the valence band under strong-field excitation, to energies as high as 6 eV above the conduction band minimum. Extensions of these experiments to other semiconductors, such as germanium, and other transition metal oxides, such as vanadium dioxide, are discussed. Germanium is of particular interest because it should be possible to follow both electron and hole dynamics in a single measurement using transient XUV absorption.
Original languageEnglish
Pages (from-to)C57-C64
JournalJournal of the Optical Society of America / B
Volume33
Issue number7
DOIs
Publication statusPublished - 1 Jul 2016
Externally publishedYes

Keywords

  • Multiharmonic generation
  • Spectroscopy, semiconductors
  • Ultrafast processes in condensed matter, including semiconductors
  • Attosecond pulses
  • Electric fields
  • Oscillator strengths
  • Strong field physics
  • Ultraviolet radiation
  • Visible light

Fields of Expertise

  • Advanced Materials Science

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