Conductance Fluctuations and Field Asymmetry of Rectification in Graphene

2009/10/31 by Claudia Ojeda‐Aristizabal, C. Ojeda-Aristizabal, M. Monteverde +6
Materials Science · Physics and Astronomy · #Asymmetry #Bilayer graphene #Condensed matter physics #Conductance #Graphene #Graphene research and applications #Mesoscopic physics #Physics #Quantum and electron transport phenomena #Quantum mechanics #Surface and Thin Film Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.104.186802

published as Phys. Rev. Lett. 104, 186802 (2010) · Panel c in figure 4 represented differently

openalex publication_date 2010/05/03 · arxiv created 2010/05/28 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate conductance fluctuations as a function of carrier density n and magnetic field in diffusive mesoscopic samples made from monolayer and bilayer graphene. We show that the fluctuations' correlation energy and field, which are functions of the diffusion coefficient, have fundamentally different variations with n, illustrating the contrast between massive and massless carriers. The field dependent fluctuations are nearly independent of n, but the n-dependent fluctuations are not universal and are largest at the charge neutrality point. We also measure the second-order conductance fluctuations (mesoscopic rectification). Its field asymmetry, due to electron-electron interaction, decays with conductance, as predicted for diffusive systems.

Citations

• Signature of the Electron-Electron Interaction in the Magnetic-Field Dependence of NonlinearI−VCharacteristics in Mesoscopic Systems
• Transport and Elastic Scattering Times as Probes of the Nature of Impurity Scattering in Single-Layer and Bilayer Graphene
• Mesoscopic Fluctuations of Nonlinear Conductance of Chaotic Quantum Dots
• Magnetic Field Symmetry and Phase Rigidity of the Nonlinear Conductance in a Ring