Femtosecond time-resolved two-photon photoemission studies of electron dynamics in metals

Petek, Hrvoje; Ogawa, S.

doi:10.1016/s0079-6816(98)00002-1

Cited by 709 publications

(581 citation statements)

References 190 publications

Supporting

Mentioning

567

Contrasting

Unclassified

Order By: Relevance

“…The spectroscopy of surface states on the (1 1 1) surfaces of noble metals has been discussed in Sections 3 and 4. These occupied surface states can be seen as initial states in 2PPE [34,226] and linewidths comparable to regular photoelectron spectroscopy are observed [4,223,227,228]. An exception among the noble-metal surfaces is Pd (1 1 1) where the intrinsic surface state is unoccupied [229].…”

Section: Lifetimes Of Surface States On Clean Metal Surfacesmentioning

confidence: 69%

Decay of electronic excitations at metal surfaces

Echenique

Berndt

Chulkov

et al. 2004

Surface Science Reports

436

403

View full text Add to dashboard Cite

Section: Lifetimes Of Surface States On Clean Metal Surfacesmentioning

confidence: 69%

Decay of electronic excitations at metal surfaces

Echenique

Berndt

Chulkov

et al. 2004

Surface Science Reports

436

403

View full text Add to dashboard Cite

“…mPP spectroscopy usually measures the energy levels and band dispersions of the initial, intermediate, and final states that are coupled by optical transitions in a multiphoton absorption process [81][82][83]. According to the band structure of graphite in Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Multiphoton Thermionic Photoemission from Graphite

et al. 2017

View full text Add to dashboard Cite

Electronic heating of cold crystal lattices in nonlinear multiphoton excitation can transiently alter their physical and chemical properties. In metals where free electron densities are high and the relative fraction of photoexcited hot electrons is low, the effects are small, but in semimetals, where the free electron densities are low and the photoexcited densities can overwhelm them, the intense femtosecond laser excitation can induce profound changes. In semimetal graphite and its derivatives, strong optical absorption, weak screening of the Coulomb potential, and high cohesive energy enable extreme hot electron generation and thermalization to be realized under femtosecond laser excitation. We investigate the nonlinear interactions within a hot electron gas in graphite through multiphoton-induced thermionic emission. Unlike the conventional photoelectric effect, within about 25 fs, the memory of the excitation process, where resonant dipole transitions absorb up to eight quanta of light, is erased to produce statistical Boltzmann electron distributions with temperatures exceeding 5000 K; this ultrafast electronic heating causes thermionic emission to occur from the interlayer band of graphite. The nearly instantaneous thermalization of the photoexcited carriers through Coulomb scattering to extreme electronic temperatures characterized by separate electron and hole chemical potentials can enhance hot electron surface femtochemistry, photovoltaic energy conversion, and incandescence, and drive graphite-to-diamond electronic phase transition.

show abstract

“…Identical pump-probe pulse replicas are generated in a self-made Mach-Zehnder Interferometer (MZI) 12,13 . The pump-probe delay is scanned with a piezoelectrically actuated translation stage at a rate of 7.9 fs/s.…”

Section: Methods Summarymentioning

confidence: 99%

Transient excitons at metal surfaces

et al. 2014

View full text Add to dashboard Cite

Excitons, electron-hole pairs bound by the Coulomb potential, are fundamental quasiparticles of coherent light-matter interaction energizing processes from photosynthesis to optoelectronics 1−5 . Excitons are observed in semiconductors, and their existence is implicit in the quantum theory of metals, yet their appearance is tenuous due to the screening of the Coulomb interaction on few femtosecond timescale 6−8 .Here we present direct evidence for the dominant transient excitonic response at a Ag(111) surface, which precedes the full screening of the Coulomb interaction, in the course of a three-photon photoemission process with <15 femtosecond laser pulses. Electron-hole pair interaction through the excitonic response introduces coherent quasiparticle correlations beyond the single-particle description of the optics of metals, which dominate the multi-photon photoemission process.Reflection of light has made metal mirrors valued optical instruments since the bronze age 9 . At the macroscopic level the coherent optical response of a metallic surface is well described by the classical Maxwell's equations. At the quantum level, a photon interacting with a metal surface polarizes an electron-hole (e-h) pair to create an exciton-polariton, the arXiv:1405.0977v2 [cond-mat.mes-hall]

show abstract

Femtosecond time-resolved two-photon photoemission studies of electron dynamics in metals

Cited by 709 publications

References 190 publications

Decay of electronic excitations at metal surfaces

Decay of electronic excitations at metal surfaces

Ultrafast Multiphoton Thermionic Photoemission from Graphite

Transient excitons at metal surfaces

Contact Info

Product

Resources

About