Accession Number:

ADA619937

Title:

Attosecond Electron Processes in Materials: Excitons, Plasmons, and Charge Dynamics

Descriptive Note:

Final rept. 1 May 2014-30 Apr 2015

Corporate Author:

CALIFORNIA UNIV REGENTS BERKELEY

Personal Author(s):

Report Date:

2015-05-19

Pagination or Media Count:

24.0

Abstract:

A five year program focusing on investigation of attosecond electron dynamics in solid state materials is completed. Two experimental apparatuses for attosecond time-resolved extreme ultraviolet XUV studies were constructed. Highlights of results are a 450 attosecond electronic response time in the conduction band of silicon was experimentally measured by observing steps in the L2,3-edge spectrum of silicon, synchronized with the excitation laser electric field. Independent electron and hole dynamics were observed in germanium by time-resolved ultrafast measurements on the M4,5-edge spectrum of germanium. A near-instantaneous spectral response over a broad range around the vanadium M2,3-edge, followed by a fast reshaping of the spectrum, was observed in VO2, suggesting a signature of the ultrafast insulator to metal transition.

Subject Categories:

  • Physical Chemistry
  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy
  • Nuclear Physics and Elementary Particle Physics
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE