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Electron pair escape from fullerene cage via collective modes.

Schüler M, Pavlyukh Y, Bolognesi P, Avaldi L, Berakdar J - Sci Rep (2016)

Bottom Line: Experiment and theory evidence a new pathway for correlated two-electron release from many-body compounds following collective excitation by a single photon.Results from a full ab initio implementation for C60 fullerene are in line with experimental observations.The findings endorse the correlated two-electron photoemission as a powerful tool to access electronic correlation in complex systems.

View Article: PubMed Central - PubMed

Affiliation: Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany.

ABSTRACT
Experiment and theory evidence a new pathway for correlated two-electron release from many-body compounds following collective excitation by a single photon. Using nonequilibrium Green's function approach we trace plasmon oscillations as the key ingredient of the effective electron-electron interaction that governs the correlated pair emission in a dynamic many-body environment. Results from a full ab initio implementation for C60 fullerene are in line with experimental observations. The findings endorse the correlated two-electron photoemission as a powerful tool to access electronic correlation in complex systems.

No MeSH data available.


Related in: MedlinePlus

(a) DPE Setup: upon absorbing one photon with energy ω, two correlated electrons are emitted non-sequentially from the C60 molecule and detected in coincidence. Charge-density fluctuations play the key role for the correlation hereby. (b) For equal energies of the emitted electrons  eV, the normalized coincidence yield versus C60 binding energy (red squares with error bars) is compared to the Auger spectrum with ω = 340 eV (black dots). The latter is compared to our calculations of the joint density of states (JDOS) (shaded blue line).
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f1: (a) DPE Setup: upon absorbing one photon with energy ω, two correlated electrons are emitted non-sequentially from the C60 molecule and detected in coincidence. Charge-density fluctuations play the key role for the correlation hereby. (b) For equal energies of the emitted electrons  eV, the normalized coincidence yield versus C60 binding energy (red squares with error bars) is compared to the Auger spectrum with ω = 340 eV (black dots). The latter is compared to our calculations of the joint density of states (JDOS) (shaded blue line).

Mentions: For the electron gas in particular, focus was put on two aspects affecting the two-particle interaction. 1) Long wave-length density fluctuations which are characterized by the presence of classical excitations (plasmons) and are well captured, for instance by the time-dependent density functional theory (TDDFT) or the random phase approximation1718. 2) Short wave-length effects (exhibited in the on-top pair distribution function192021) which are captured by the ladder diagrams2223. Exploiting the tunability of synchrotron radiation, DPE (cf. Fig. 1(a)) can be tuned to an energy region where the dynamic and non-local field of collective excitations (plasmons) is the main driving for secondary electron emission whilst short-range effects govern the formation of two-particle scattering states.


Electron pair escape from fullerene cage via collective modes.

Schüler M, Pavlyukh Y, Bolognesi P, Avaldi L, Berakdar J - Sci Rep (2016)

(a) DPE Setup: upon absorbing one photon with energy ω, two correlated electrons are emitted non-sequentially from the C60 molecule and detected in coincidence. Charge-density fluctuations play the key role for the correlation hereby. (b) For equal energies of the emitted electrons  eV, the normalized coincidence yield versus C60 binding energy (red squares with error bars) is compared to the Auger spectrum with ω = 340 eV (black dots). The latter is compared to our calculations of the joint density of states (JDOS) (shaded blue line).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834545&req=5

f1: (a) DPE Setup: upon absorbing one photon with energy ω, two correlated electrons are emitted non-sequentially from the C60 molecule and detected in coincidence. Charge-density fluctuations play the key role for the correlation hereby. (b) For equal energies of the emitted electrons  eV, the normalized coincidence yield versus C60 binding energy (red squares with error bars) is compared to the Auger spectrum with ω = 340 eV (black dots). The latter is compared to our calculations of the joint density of states (JDOS) (shaded blue line).
Mentions: For the electron gas in particular, focus was put on two aspects affecting the two-particle interaction. 1) Long wave-length density fluctuations which are characterized by the presence of classical excitations (plasmons) and are well captured, for instance by the time-dependent density functional theory (TDDFT) or the random phase approximation1718. 2) Short wave-length effects (exhibited in the on-top pair distribution function192021) which are captured by the ladder diagrams2223. Exploiting the tunability of synchrotron radiation, DPE (cf. Fig. 1(a)) can be tuned to an energy region where the dynamic and non-local field of collective excitations (plasmons) is the main driving for secondary electron emission whilst short-range effects govern the formation of two-particle scattering states.

Bottom Line: Experiment and theory evidence a new pathway for correlated two-electron release from many-body compounds following collective excitation by a single photon.Results from a full ab initio implementation for C60 fullerene are in line with experimental observations.The findings endorse the correlated two-electron photoemission as a powerful tool to access electronic correlation in complex systems.

View Article: PubMed Central - PubMed

Affiliation: Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle, Germany.

ABSTRACT
Experiment and theory evidence a new pathway for correlated two-electron release from many-body compounds following collective excitation by a single photon. Using nonequilibrium Green's function approach we trace plasmon oscillations as the key ingredient of the effective electron-electron interaction that governs the correlated pair emission in a dynamic many-body environment. Results from a full ab initio implementation for C60 fullerene are in line with experimental observations. The findings endorse the correlated two-electron photoemission as a powerful tool to access electronic correlation in complex systems.

No MeSH data available.


Related in: MedlinePlus