標題: Kondo effect in coupled quantum dots with RKKY interaction: Effects of finite temperature and magnetic field
作者: Chung, Chung-Hou
Hofstetter, Walter
電子物理學系
Department of Electrophysics
公開日期: 1-七月-2007
摘要: We study transport through two quantum dots coupled by a Ruderman-Kittel-Kasuya-Yoshida interaction as a function of temperature and magnetic field. By applying the numerical renormalization group method, we obtain the transmission and the linear conductance. At zero temperature and magnetic field, we observe a quantum phase transition between the Kondo screened state and a local spin singlet as the RKKY interaction is tuned. Above the critical RKKY coupling, the Kondo peak is split. However, we find that both finite temperature and magnetic field restore the Kondo resonance. Our results agree well with recent transport experiments on gold grain quantum dots in the presence of magnetic impurities [H. B. Heersche , Phys. Rev. Lett. 96, 017205 (2006)].
URI: http://dx.doi.org/10.1103/PhysRevB.76.045329
http://hdl.handle.net/11536/10577
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.76.045329
期刊: PHYSICAL REVIEW B
Volume: 76
Issue: 4
起始頁: 0
結束頁: 0
顯示於類別:期刊論文


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