Fermi-edge singularity in nonequilibrium systems
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay Road, Kowloon (Hong Kong)
In this paper the problem of Fermi-edge singularity is studied in detail for a class of nonequilibrium systems with more than one Fermi seas with different chemical potentials coupling to each other. The problem is solved by generalizing the solution of Nozi{acute e}res and De Domincis for (equilibrium) single Fermi sea system to the nonequilibrium situation described in this paper. The concepts of nonequilibrium {ital T} matrices and phase shifts are introduced in this paper where a generalized Fumi theorem is being proved. We find that Fermi-edge singularities are found in {ital all} Fermi surfaces in the system. However the singularities are smeared out by a lifetime effect associated with finite potential differences between different Fermi seas. Some consequences of the result are pointed out. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383215
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 8 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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