@article{c7efb7636b1e4911967a3821988e90cc,
title = "Enhanced Kondo effect via tuned orbital degeneracy in a spin 1/2 artificial atom",
abstract = "A strong Kondo effect in vertical quantum dot holding an odd number of electrons and spin 1/2 was investigated. The estimated Kondo temperature for 'doublet-doublet' degeneracy was found to be similar to that for singlet-triplet degeneracy with an even electron number, indicating that a total of fourfold spin and orbital degeneracy accounts for enhancement of the Kondo temperature. An orbital degeneracy for odd N and S = 1/2 dramatically enhanced the Kondo effect. The results show that an SU(4) model at orbital degeneracy is used to qualitatively reproduce experimental observation.",
author = "S. Sasaki and S. Amaha and N. Asakawa and M. Eto and S. Tarucha",
note = "Funding Information: The authors acknowledge valuable discussions with ?>T. Sato, W. Izumida, L. I. Glazman, H. Hyuga, ?>M. Stopa, and J. Kondo. The work is supported by the financial support from the Grant-in-Aid for Scientific Research A (Grant No. 40302799), the Nano-Photonic and Electron Devices Technology Project, the Focused Research and Development Project for the Realization of the World{\textquoteright}s Most Advanced IT Nation, and SORST-JST. ",
year = "2004",
month = jul,
day = "2",
doi = "10.1103/PhysRevLett.93.017205",
language = "English",
volume = "93",
pages = "017205--1--017205--4",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "1",
}