Kondo effect in coupled quantum dots under magnetic fields

Tomosuke Aono, Mikio Eto

研究成果: Article査読

18 被引用数 (Scopus)

抄録

The Kondo effect in coupled quantum dots is investigated theoretically under magnetic fields. We show that the magnetoconductance (MC) illustrates the peak structures of Kondo resonant spectra. When the dot-dot tunneling coupling Vc is smaller than the dot-lead coupling Δ (level broadening), Kondo resonant levels appear at the Fermi level (EF). The Zeeman splitting of the levels weakens the Kondo effect, which results in a negative MC. When Vc is larger thanΔ, the Kondo resonances form bonding and antibonding levels, located below and above EF, respectively. We observe a positive MC since the Zeeman splitting increases the overlap between the levels at EF. In the presence of antiferromagnetic spin coupling between the dots, the sign of the MC can change as a function of the gate voltage.

本文言語English
論文番号073307
ページ(範囲)733071-733074
ページ数4
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
64
7
DOI
出版ステータスPublished - 2001 8月 15

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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