Logarithmic temperature dependence of conductivity at half-integer filling factors: Evidence for interaction between composite fermions

Abstract

We have studied the temperature dependence of diagonal conductivity in high-mobility two-dimensional samples at filling factors $\nu =1/2$ and 3/2 at low temperatures. We observe a logarithmic dependence on temperature, from our lowest temperature of 13 mK up to 400 mK. We attribute the logarithmic correction to the effects of interaction between composite fermions, analogous to the Altshuler-Aronov type correction for electrons at zero magnetic field. The paper is accepted for publication in Physical Review B, Rapid Communications.

uses revtex macros

Cited by in corpus (18)

• Mirror symmetry and the half-filled Landau level
• Magnetoresistance of Two-Dimensional Fermions in a Random Magnetic Field
• Scaling flow diagram in the fractional quantum Hall regime of GaAs/AlGaAs heterostructures
• Quantum corrections to the conductivity of fermion - gauge field models: Application to half filled Landau level and high-$T_c$ superconductors
• Universality and Phase Diagram around Half-filled Landau Level
• Piezoelectric electron-phonon interaction in impure semiconductors: 2D electrons versus composite fermions
• Effect of gauge-field interaction on fermion transport in 2D: Hartree conductivity correction and dephasing
• Composite fermions in graphene fractional quantum Hall state at half filling: evidence for Dirac composite fermions
• Thermopower and Nernst measurements in a half-filled lowest Landau level
• High temperature resistivity measured at ν = 5/2 as a predictor of 2DEG quality in the N=1 Landau level
• Diffusion Thermopower at Even Denominator Fractions
• Composite fermions in a wide quantum well in the vicinity of the filling factor 1/2
• Measurements of Composite Fermion Conductivity Dependence on Carrier Density
• Phase transition from a composite fermion liquid to a Wigner solid in the lowest Landau level of ZnO
• Phonon Scattering of Composite Fermions
• Experimental evidence of a metal-insulator transition in a half-filled Landau level
• Resistivity of two-dimensional systems in a magnetic field at the filling factor 1/2
• Magnetoresistance and Hall Constant of Composite Fermions