Signatures of a Novel Fermi Liquid in a Two-Dimensional Composite Particle Metal

H. C. Manoharan; M. Shayegan; S. J. Klepper

doi:10.1103/PhysRevLett.73.3270

Signatures of a Novel Fermi Liquid in a Two-Dimensional Composite Particle Metal

H. C. Manoharan, M. Shayegan, and S. J. Klepper

Phys. Rev. Lett. 73, 3270 – Published 12 December 1994

Abstract

Quasiparticle excitation gaps of the $ν = \frac{p}{(2 p + 1)}$ fractional quantum Hall states in a low-disorder two-dimensional hole system are observed to scale linearly with $\frac{(\frac{e^{2}}{ε ℓ_{B}})}{(2 p + 1)}$ , predicted by the Chern-Simons gauge field theory if a hole-flux composite particle Fermi liquid forms around filling $ν = \frac{1}{2}$ ( $ℓ_{B}$ is the magnetic length). The effective mass and quantum lifetime of these new particles reveal a remarkable renormalization structure, including a strongly diverging mass and enhanced scattering close to the Fermi surface, suggesting a novel class of marginal Fermi liquid behavior.

Received 13 June 1994

DOI:https://doi.org/10.1103/PhysRevLett.73.3270

Authors & Affiliations

H. C. Manoharan^1,2, M. Shayegan^1,2, and S. J. Klepper²

¹Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544
²Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139