### Abstract

A nonequilibrium Green's functions approach to the collective response of correlated Coulomb systems at finite temperatures is presented. It is shown that solving Kadanoff-Baym-type equations of motion for the two-time correlation functions including the external perturbing field allows one to compute the plasmon spectrum with collision effects in a systematic and consistent way. The scheme has a "built-in" sum-rule preservation and is simpler to implement numerically than the equivalent equilibrium approach based on the Bethe-Salpeter equation.

Original language | English (US) |
---|---|

Pages (from-to) | 1768-1771 |

Number of pages | 4 |

Journal | Physical Review Letters |

Volume | 84 |

Issue number | 8 |

State | Published - Feb 21 2000 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Physical Review Letters*,

*84*(8), 1768-1771.

**Real-Time Kadanoff-Baym Approach to Plasma Oscillations in a Correlated Electron Gas.** / Kwong, Nai-Hang; Bonitz, M.

Research output: Contribution to journal › Article

*Physical Review Letters*, vol. 84, no. 8, pp. 1768-1771.

}

TY - JOUR

T1 - Real-Time Kadanoff-Baym Approach to Plasma Oscillations in a Correlated Electron Gas

AU - Kwong, Nai-Hang

AU - Bonitz, M.

PY - 2000/2/21

Y1 - 2000/2/21

N2 - A nonequilibrium Green's functions approach to the collective response of correlated Coulomb systems at finite temperatures is presented. It is shown that solving Kadanoff-Baym-type equations of motion for the two-time correlation functions including the external perturbing field allows one to compute the plasmon spectrum with collision effects in a systematic and consistent way. The scheme has a "built-in" sum-rule preservation and is simpler to implement numerically than the equivalent equilibrium approach based on the Bethe-Salpeter equation.

AB - A nonequilibrium Green's functions approach to the collective response of correlated Coulomb systems at finite temperatures is presented. It is shown that solving Kadanoff-Baym-type equations of motion for the two-time correlation functions including the external perturbing field allows one to compute the plasmon spectrum with collision effects in a systematic and consistent way. The scheme has a "built-in" sum-rule preservation and is simpler to implement numerically than the equivalent equilibrium approach based on the Bethe-Salpeter equation.

UR - http://www.scopus.com/inward/record.url?scp=0000969355&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000969355&partnerID=8YFLogxK

M3 - Article

C2 - 21923209

AN - SCOPUS:0000969355

VL - 84

SP - 1768

EP - 1771

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 8

ER -