Persistent Current in a Mesoscopic Ring Side-Attached with a Quantum Dot
ZHOU Bo1, CHEN Xiong-Wen2, LI Tie1, NIE Yu-Mei1, WU Shao-Quan3
1School of Mathematics and Physics, Chongqing Institute of Technology, Chongqing 400050
2Department of Physics, College of Huaihua, Huaihua 418008
3Department of Physics, Sichuan Normal University, Chengdu 610066
Persistent Current in a Mesoscopic Ring Side-Attached with a Quantum Dot
ZHOU Bo1;CHEN Xiong-Wen2; LI Tie1; NIE Yu-Mei1;WU Shao-Quan3
1School of Mathematics and Physics, Chongqing Institute of Technology, Chongqing 400050
2Department of Physics, College of Huaihua, Huaihua 418008
3Department of Physics, Sichuan Normal University, Chengdu 610066
Abstract： We theoretically investigate properties of the ground state of a closed dot-ring system with a magnetic flux in the Kondo regime by means of a tight-banding Anderson Hamiltonian, using the Slave--Boson mean-field approach. The persistent current shows interesting dependences on the parity and on the size of the system. The signature of Kondo resonance at xik/L=0.15 is expected to be observed experimentally in the future. With the intensity of the coupling tD changes from weak to strong, the properties of the system changes largely, which are different from the in-line one because of the attached dot.
ZHOU Bo;CHEN Xiong-Wen; LI Tie; NIE Yu-Mei;WU Shao-Quan. Persistent Current in a Mesoscopic Ring Side-Attached with a Quantum Dot[J]. 中国物理快报, 2005, 22(11): 2918-2921.
ZHOU Bo, CHEN Xiong-Wen, LI Tie, NIE Yu-Mei, WU Shao-Quan. Persistent Current in a Mesoscopic Ring Side-Attached with a Quantum Dot. Chin. Phys. Lett., 2005, 22(11): 2918-2921.
2005, Vol. 22 
