量子ドット分子の近藤効果(有限量子多体系の励起構造と相関効果-原子核・量子ドット・ボース凝縮・クラスターを中心として-,研究会報告)
2002 年 105 巻 3 号 p. C102-C104
詳細
2002 年 105 巻 3 号 p. C102-C104
The Kondo effect in coupled quantum dots is investigated theoretically under magnetic fields. We show that the magnetoconductance (MC) illustrates peak structures of the Kondo resonant spectra. When the dot-dot tunneling coupling V_C is smaller than the dot-lead coupling Δ (level broadening), the Kondo resonant levels appear at the Fermi level (E_F). The Zeeman splitting of the levels weakens the Kondo effect, which results in a negative MC. When V_C is larger than Δ, the Kondo resonances form bonding and anti-bonding levels, located below and above E_F, respectively. We observe a positive MC since the Zeeman splitting increases the overlap between the levels at E_F.
