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

TL;DR

This study reveals a logarithmic temperature dependence of conductivity at half-integer filling factors in high-mobility two-dimensional systems, indicating interactions between composite fermions similar to electron-electron interactions in zero magnetic field.

Contribution

It provides experimental evidence for interaction effects between composite fermions, demonstrating a logarithmic temperature dependence of conductivity at specific filling factors.

Findings

Logarithmic temperature dependence observed from 13 mK to 400 mK.

Attribution of the correction to composite fermion interactions.

Analogous to Altshuler-Aronov correction for electrons.

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.