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Linear response theory for a highly excited system far from equilibrium

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  • Heiner, E.

Abstract

In this paper a generalization of Kubo's linear response theory is treated for systems which are driven far off equilibrium by external fields. The reduced density operator is calculated by a time-dependent projector technique in a fast moving reference frame. The response of the system with respect to a second retarded probe pulse is considered which reflects the higher complexity of the corresponding equations in comparison with Kubo's linear response theory. The response of a virtually excited exciton system to a white probe pulse is discussed for a highly excited semiconductor in the athermal stage and in the low density limit. The poles of the two-particle Green's functions contain the differences of time-dependent shifted quasi particle energies. This behavior reflects the dynamic renormalization of the band structure as the laser induced gap creation or the dynamic Stark effect.

Suggested Citation

  • Heiner, E., 1990. "Linear response theory for a highly excited system far from equilibrium," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 166(3), pages 633-650.
  • Handle: RePEc:eee:phsmap:v:166:y:1990:i:3:p:633-650
    DOI: 10.1016/0378-4371(90)90077-6
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    1. King, Ronald F. & Jackson, Steven I. & Katz, Claudio J. & Mahler, Vincent A. & Franz, Michael G., 1986. "The Impact of Taxes in Developed Capitalist Countries," American Political Science Review, Cambridge University Press, vol. 80(1), pages 251-257, March.
    2. Mahler, Vincent A., 1981. "Britain, the European Community, and the developing Commonwealth: dependence, interdependence, and the political economy of sugar," International Organization, Cambridge University Press, vol. 35(3), pages 467-492, July.
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