Persistent currents in mesoscopic rings with a quantum dot

Abstract

Using the Anderson model in the Kondo regime, we calculate the persistent current j in a ring with an embedded quantum dot (QD) as a function of the Aharonov-Bohm flux Phi for different ring length L, temperature T and broadening of the conduction states delta . For T=delta =0 and L >> xi, where xi is the Kondo screening length, Lj tends to the value for a non interacting ideal ring, while it is suppressed for a side coupled QD. For any L/xi, Lj is also suppressed when either T or delta increase above a fraction of the level spacing which depends on Phi.

5 pages, 6 figures, submitted to Phys. Rev. B, (Refs. added)

References in corpus (4)

• Mesoscopic Kondo screening effect in a single-electron transistor embedded in a metallic ring
• Kondo and anti-Kondo resonances in transport through nanoscale devices
• Many-body theory of the quantum mirage
• Kondo Effect and Persistent Currents in a Mesoscopic Ring: Numerically Exact Results

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