量子点中的可调谐近藤效应。

A tunable kondo effect in quantum dots.

作者信息

Cronenwett SM, Oosterkamp TH, Kouwenhoven LP

机构信息

S. M. Cronenwett, Department of Applied Physics and DIMES, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands, and Department of Physics, Stanford University, Stanford, CA, 94305-4060, USA. T. H. Oosterkam.

出版信息

Science. 1998 Jul 24;281(5376):540-4. doi: 10.1126/science.281.5376.540.

DOI:10.1126/science.281.5376.540

PMID:9677192

Abstract

A tunable Kondo effect has been realized in small quantum dots. A dot can be switched from a Kondo system to a non-Kondo system as the number of electrons on the dot is changed from odd to even. The Kondo temperature can be tuned by means of a gate voltage as a single-particle energy state nears the Fermi energy. Measurements of the temperature and magnetic field dependence of a Coulomb-blockaded dot show good agreement with predictions of both equilibrium and nonequilibrium Kondo effects.

摘要

在小量子点中实现了可调谐的近藤效应。随着量子点上电子数从奇数变为偶数，量子点可以从近藤体系转变为非近藤体系。当单粒子能态接近费米能时，可通过栅极电压调节近藤温度。对库仑阻塞量子点的温度和磁场依赖性测量结果与平衡和非平衡近藤效应的预测结果吻合良好。