Relaxation of excited electrons in a paramagnetic electron gas: The role of spins in screening and scattering

Nágy, I.; Alducin, M.; Juaristi, J. I.; Echenique, Pedro M.

doi:10.1103/physrevb.64.075101

Cited by 8 publications

(7 citation statements)

References 43 publications

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“…The theoretical challenge for the future will be the extension of many-body calculations of quasiparticle dynamics to more complex systems such as quantum states in semimetals and their surfaces [339][340][341][342][343], quantum well states confined to a substrate surface [57,320], adatom-and molecule-induced states on metal substrates [344,345], spin-dependent quantum states on clean ferromagnetic surfaces [195,196,[313][314][315][316][317] and these surfaces covered with molecules. This extension should be accompanied by analysis of the role of different approximations used in the theory, for instance, the role of non-linear effects in screening [346][347][348][349][350], the importance of vertex corrections in many-body calculations of the electron-electron contribution [16], and the role of short-range strong correlations [351] in quasiparticle dynamics. One can expect more first-principles calculations for electron and hole dynamics in surface states on metals.…”

Section: Discussionmentioning

confidence: 99%

Decay of electronic excitations at metal surfaces

Echenique

Berndt

Chulkov

et al. 2004

Surface Science Reports

438

403

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Section: Discussionmentioning

confidence: 99%

Decay of electronic excitations at metal surfaces

Echenique

Berndt

Chulkov

et al. 2004

Surface Science Reports

438

403

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“…In general, the results obtained from the use of the cumulant expansion and from nonequilibrium Green function methods are in agreement with the GW calculation results for electron and hole dynamics. Nagy et al . − have recently studied the role of spin and charge in the screening of electron−electron interaction in the free electron gas model, going beyond the random phase approximation (RPA). For that they used the Landau kinetic model of relaxation rate at energies close to the Fermi level.…”

Section: Introductionmentioning

confidence: 99%

Electronic Excitations in Metals and at Metal Surfaces

et al. 2006

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“…[81,82] These treatments are based on phase-shift calculations from kinetic theory [81] and a modification of the Schwinger variational principle of scattering theory, [82] both implemented for electrons in a FEG. The role of spin fluctuations in the screening and the scattering of excited electrons in a FEG has also been discussed [83] in the framework of kinetic theory, with the use of simple physically motivated models.…”

Section: Discussionmentioning

confidence: 99%

Ultrafast Electron Dynamics in Metals

et al. 2004

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During the last decade, significant progress has been achieved in the rapidly growing field of the dynamics of hot carriers in metals. Here we present an overview of the recent achievements in the theoretical understanding of electron dynamics in metals, and focus on the theoretical description of the inelastic lifetime of excited hot electrons. We outline theoretical formulations of the hot-electron lifetime that is originated in the inelastic scattering of the excited quasiparticle with occupied states below the Fermi level of the solid. First-principles many-body calculations are reviewed. Related work and future directions are also addressed.Keywords: ab initio calculations, electron lifetimes, femtochemistry, time-resolved spectroscopy, many-body INTRODUCTIONRecent advances in femtosecond laser technology have made possible the investigation of electron transfer processes at solid surfaces, which are known to be the basis for many fundamental steps in surface photochemistry and ultrafast chemical reactions. [1,2,3] These are typically atomic and molecular adsorption processes and catalytic reactions between different chemical species, which transfer energy from the reaction complex into the nuclear and electronic degrees of freedom of the solid substrate. These reactions may induce elementary excitations, such as quantized lattice vibrations (phonons), collective electronic excitations (plasmons), and electronhole (e-h) pairs. In metals, the excitation of e-h pairs leads to an excited or hot electron with energy above the Fermi level ε F and to an excited or hot hole with energy below ε F . It is precisely the coupling of these hot carriers with the underlying substrate which governs the cross sections and branching ratios of electronically induced adsorbate reactions at metal surfaces.It is the intent of this Review to discuss the current status of the rapidly growing field of the dynamics of hot carriers in metals. The energy relaxation of these hot electrons and holes is almost exclusively attributed to the inelastic scattering with cold electrons below the Fermi level (e-e scattering) and with phonons (e-ph scattering), since radiative recombination of e-h pairs may be neglected. Assuming that the excess energy of the hot carrier is much larger than the thermal energy k B T , the e-e scattering rate does not depend on temperature. Furthermore, for excitation energies larger than ∼ 1 eV inelastic lifetimes are dominated by e-e scattering, e-ph interactions being in general of minor importance. Only at energies closer to the Fermi level, where the e-e inelastic lifetime increases rapidly, does e-ph scattering become important. [4,5] Different techniques have recently become available for measuring hot-carrier lifetimes. Inverse photoemission (IPE) [6] and high resolution angle resolved photoemission (ARPE) [7] provide an indirect access to the lifetime of hot electrons and holes, respectively, by measuring the energetic broadening of transition lines after impigning an electron (IPE) or a photon (ARPE) in...

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Relaxation of excited electrons in a paramagnetic electron gas: The role of spins in screening and scattering

Cited by 8 publications

References 43 publications

Decay of electronic excitations at metal surfaces

Decay of electronic excitations at metal surfaces

Electronic Excitations in Metals and at Metal Surfaces

Ultrafast Electron Dynamics in Metals

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