Münster 1997 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 10: Niederdimensionale Systeme, Lokalisierung
TT 10.2: Vortrag
Dienstag, 18. März 1997, 14:45–15:00, F1
Quasi-Partile Behavior of Composite Fermions in the Half-Filled Landau Level — •P. Kopietz1 and G. E. Castilla2 — 1Institut f"ur Theoretische Physik, Universit"at G"ottingen, Bunsenstr. 9, D-37073 G"ottingen — 2University of California, Riverside, CA 92521, USA
We calculate the effect of infrared fluctuations of the Chern-Simons gauge field on the single-particle Green’s function of composite fermions in the half-filled Landau level via higher-dimensional bosonization on a curved Fermi surface [1,2]. We find that composite fermions remain well-defined quasi-particles, with an effective mass given by the mean-field value, but with anomalously large damping and a spectral function that contains considerable weight away from the quasi-particle peak. We also discuss the experimental situation.
[1] P. Kopietz and G. E. Castilla, Phys. Rev. Lett. 76, 4777 (1996)
[2] P. Kopietz, Bosonization of Interacting Fermions in Arbitrary Dimensions, to appear in Lecture Notes in Physics m: Monographs, (Springer, Berlin, 1997)