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Correlation effects mediated by disorders in one-dimensional channels

Vivek Kumar1, Yingshi Duo1, Patrick See2, Jonathan P. Griffiths3, David A. Ritchie3, Ian Farrer4, and Sanjeev Kumar1,*

  • *Contact author: sanjeev.kumar@ucl.ac.uk
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Phys. Rev. B 112, 035404 – Published 7 July, 2025

DOI: https://doi.org/10.1103/k8zm-v738

Abstract

We report nonlinear transport in one-dimensional quantum wires formed in a GaAs/AlGaAs heterostructure. The two-terminal conductance characteristics were investigated under varying electron concentrations with and without a large in-plane magnetic field of 10 T. One important observation was that the 0.7-like feature was identified at higher-order subbands, specifically ∼1.6G0, ∼3.7G0, and ∼4.7G0. Additionally, our findings reveal the emergence of two conductance states appearing below e2/h under large dc bias voltage, where these states become more pronounced together with higher 0.7-like features, as electron concentration decreases, highlighting the influence of strong correlation effects in their formation. The weak Zeeman splitting in the ground state despite a large in-plane magnetic field of 10 T in low-density and weakly confined regime indicates disordered-induced correlation effects dominating the mechanism.

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Phys. Rev. B 112, 035404– Published 7 July, 2025
  • Received 31 December 2024
  • Accepted 18 June 2025
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