Gate-tuned two-channel Kondo screening by graphene leads: Universal scaling of the nonlinear conductance

2013/02/19 by Tsung-Han Lee, Kenneth Yi-Jieh Zhang, Lee, Tsung-Han +6
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Quantum and electron transport phenomena #Strongly Correlated Electrons (cond-mat.str-el) #Surface and Thin Film Phenomena #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.1302.4657

5 pages, 5 figures, supplemental material included

arxiv created 2013/02/19 · openalex publication_date 2013/02/19 · arxiv updated 2013/02/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Based on the non-crossing approximation, we calculate both the linear and nonlinear conductance within the two-lead two-channel single-impurity Anderson model where the conduction electron density of states vanishes in a power-law fashion ∝ |ω-μ_F|^r with r=1 near the Fermi energy, appropriate for an hexagonal system. For given gate voltage, we address the universal crossover from a two-channel Kondo phase, argued to occur in doped graphene, to an unscreened local moment phase. We extract universal scaling functions in conductance governing charge transfer through the two-channel pseudogap Kondo impurity and discuss our results in the context of a recent scanning tunneling spectroscopy experiment on Co-doped graphene.

Related

• Theoretical Reproduction of the Lineshapes of Nonlinear Conductance Observed in a Quantum Point Contact
• Enhancement of the two-channel Kondo effect in single-electron boxes
• Universal Crossover in the Three-Channel Charge Kondo Model at High Transparency
• Kondo effect in graphene: single vs. two-channel character
• Two-channel Kondo physics in a periodically driven single-impurity\n Anderson model