Tunable Kondo screening in a quantum dot device

2005/09/23 by Hiroyuki Tamura, L. I. Glazman, Leonid I. Glazman
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.72.121308

published as Phys. Rev. B 72, 121308(R) (2005)

openalex publication_date 2005/09/23 · arxiv created 2005/09/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We consider electron transport along a single-mode channel which is in contact, via tunnel junctions in its walls, with two quantum dots. Electron tunneling to and from the dots contributes to the electron backscattering, and thus modifies the channel conductance. If the dots carry spin, the channel conductance becomes temperature dependent due to the Kondo effect. The two-dot device geometry allows for a formation of S=1 localized spin due to the indirect exchange interaction, called Ruderman-Kittel-Kasuya-Yosida interaction. This device offers a possibility to study the crossover between fully screened and underscreened Kondo impurity. We investigate the manifestation of such crossover in the channel conductance.

Citations

• Indirect exchange interaction between two quantum dots in an Aharonov-Bohm ring
• Quantum Phase Transition in a Multilevel Dot
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