Ultrashort laser-pulse-driven currents in conductors

One-dimensional model for local excitation in the single-electron picture with quadratic dispersion

István Magashegyi, Lóránt Z. Szabó, P. Földi

Research output: Contribution to journalArticle

Abstract

The response of conduction-band electrons to a local, pulse-like external excitation is investigated. The charge density wave packets that emerge as a consequence of the excitation leave the interaction region with a speed close to the initial state's band velocity, but there are also oscillations with essentially the same frequency as that of the laser field. As a good estimation, the excitation can also be considered as a localized, time-dependent ponderomotive potential, leading to slowly varying current oscillations. The roles of all these effects are investigated for different electron energies, carrier frequencies, and sizes of the interaction area.

Original languageEnglish
Pages (from-to)A116-A125
JournalJournal of the Optical Society of America B: Optical Physics
Volume35
Issue number5
DOIs
Publication statusPublished - May 1 2018

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conductors
pulses
excitation
lasers
oscillations
electrons
carrier frequencies
wave packets
conduction bands
interactions
electron energy

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

Cite this

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AB - The response of conduction-band electrons to a local, pulse-like external excitation is investigated. The charge density wave packets that emerge as a consequence of the excitation leave the interaction region with a speed close to the initial state's band velocity, but there are also oscillations with essentially the same frequency as that of the laser field. As a good estimation, the excitation can also be considered as a localized, time-dependent ponderomotive potential, leading to slowly varying current oscillations. The roles of all these effects are investigated for different electron energies, carrier frequencies, and sizes of the interaction area.

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