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- W2000724356 abstract "We study the dephasing of fermions interacting with a fluctuating transverse gauge field. The divergence of the imaginary part of the fermion self energy at finite temperatures is shown to result from a breakdown of Fermi's golden rule due to a faster than exponential decay in time. The strong dephasing affects experiments where phase coherence is probed. This result is used to describe the suppression of Shubnikov-de Haas (SdH) oscillations of composite fermions (oscillations in the conductivity near the half-filled Landau level). We find that it is important to take into account both the effect of dephasing and the mass renormalization. We conclude that while it is possible to use the conventional theory to extract an effective mass from the temperature dependence of the SdH oscillations, the resulting effective mass differs from the $m^ast$ of the quasiparticle in Fermi liquid theory." @default.
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- W2000724356 date "1996-09-15" @default.
- W2000724356 modified "2023-09-25" @default.
- W2000724356 title "Dephasing time of composite fermions" @default.
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- W2000724356 doi "https://doi.org/10.1103/physrevb.54.8782" @default.
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