Inelastic Effects in Photoemission: Microscopic Formulation and Qualitative Discussion

Caroli, C.; Lederer-Rozenblatt, D.; Roulet, B.; Saint‐James, D.

doi:10.1103/physrevb.8.4552

Cited by 250 publications

(114 citation statements)

References 18 publications

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“…Inelastic energy losses and corresponding quantum-mechanical interference terms [52][53][54] are excluded. Furthermore, the sudden approximation for the outgoing photoelectron has been applied.…”

Section: Theorymentioning

confidence: 99%

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Sánchez-Barriga

Braun²,

Minář³

et al. 2012

Phys. Rev. B

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We have investigated the spin-dependent quasiparticle lifetimes and the strength of electron correlation effects in the ferromagnetic 3d transition metals Fe, Co, and Ni by means of spin-and angle-resolved photoemission spectroscopy. The experimental data are accompanied by state-of-the-art many-body calculations within the dynamical mean-field theory and the three-body scattering approximation, including fully relativistic calculations of the photoemission process within the one-step model. Our quantitative analysis reveals that inclusion of local many-body Coulomb interactions are of ultimate importance for a realistic description of correlation effects in ferromagnetic 3d transition metals. However, we found that more sophisticated many-body calculations with larger modifications in the case of Fe and Co are still needed to improve the quantitative agreement between experiment and theory. In general, it turned out that not only the dispersion behavior of energetic structures should be affected by nonlocal correlations but also the line widths of most of the photoemission peaks are underestimated by the current theoretical approaches. The increasing values of the on-site Coulomb interaction parameter U and the band narrowing of majority spin states obtained when moving from Fe to Ni indicate that the effect of nonlocal correlations becomes weaker with increasing atomic number, whereas correlation effects tend to be stronger.

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Section: Theorymentioning

confidence: 99%

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Sánchez-Barriga

Braun²,

Minář³

et al. 2012

Phys. Rev. B

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“…1 This review article discusses basic features of photoemission theory based on many-body scattering theory. More sophisticated theory can be developed on the basis of nonequilibrium Green's functions [2][3][4] and quantum electrodynamics. 5 These approaches are very powerful; however, they requires more theoretical background.…”

Section: Introductionmentioning

confidence: 99%

Introductory Photoemission Theory

Arai

Fujikawa

2010

ANAL. SCI.

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“…The thus obtained quasiparticle Green's functions are prerequisites for the calculations of PE, IPE, and 2PPE spectra and rates [9][10][11][12][13]. In the case of electron injection into an empty band, GK; n; t can be expressed as [14 -16]:…”

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confidence: 99%

Extreme Ultrafast Dynamics of Quasiparticles Excited in Surface Electronic Bands

et al. 2006

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We develop a many-body description of the nonadiabatic dynamics of quasiparticles in surface bands valid on an extremely ultrashort time scale by combining the formalism for the calculation of quasiparticle survival probabilities with the self-consistent treatment of the electronic response of the system. Applying this approach to the benchmark Cu(111) surface, we assess the behavior and intervals of preasymptotic electron and hole dynamics in surface bands and locate the transition to the asymptotic regime of the exponential quasiparticle decay characterized by the corrected Fermi golden rule-type of transition rate. The general validity of these findings enables distinguishing the various regimes of ultrafast electron dynamics that may be revealed in time resolved experiments. DOI: 10.1103/PhysRevLett.97.086801 PACS numbers: 73.20.ÿr, 71.10.ÿw, 78.47.+p, 79.60.ÿi The development of time resolved electron spectroscopies has enabled measurements of the surface electronic processes in the real time domain [1][2][3][4][5]. Such experiments provide direct insight into the temporal evolution of the studied systems from which information on the various relaxation processes that govern the dynamics of excited quasiparticles can be deduced. Experiments in which the time scales of relaxation are much shorter than the duration of measurement provide information on the asymptotic steady state dynamics of the excited system in its passage towards thermodynamic equilibrium. Descriptions of these processes are commonly given in terms of the rate constants that characterize asymptotic relaxation of quasiparticle states.Methods for probing the dynamics of electronic states in confined systems are usually based on electron excitation from or injection into the system, either in the one-step processes, as in direct photoemission (PE) or inverse photoemission (IPE) spectroscopy, or in the two-step laser pump-probe induced transitions, as in two-photon photoemission (2PPE) experiments. Common to all these experiments is a sudden promotion of electrons (holes) in the initially unoccupied (occupied) states after which their motion is subjected to final state (PE and IPE) or intermediate state interactions (2PPE) with the remainder of the system. These interactions give rise to relaxation and decoherence of the excited quasiparticles [6] and produce effects in the measured spectra from which the dynamics of the excited system is assessed. Energies and lifetimes of quasiparticles in surface bands have been experimentally determined dominantly in the regimes of separated time scales of relaxation and measurement and interpreted in the framework of asymptotic decay of excited states [5].However, if the act of measurement proceeds on the time scale comparable to or shorter than that of relaxation and decoherence processes, as in recent employments of laser pulse spectroscopies [7] or novel applications of x-ray techniques [8] with extreme temporal precision, the thus probed quasiparticle evolution may considerably differ from asympto...

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Inelastic Effects in Photoemission: Microscopic Formulation and Qualitative Discussion

Cited by 250 publications

References 18 publications

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Introductory Photoemission Theory

Extreme Ultrafast Dynamics of Quasiparticles Excited in Surface Electronic Bands

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