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Phys. Rev. Lett. 90, 026804 (2003) [4 pages]

Local Moment Formation in Quantum Point Contacts

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Kenji Hirose1, Yigal Meir2,3,*, and Ned S. Wingreen2
1Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan
2NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540
3Physics Department, Princeton University, Princeton, New Jersey 08540

Received 30 July 2002; published 17 January 2003

Spin-density-functional theory of quantum point contacts (QPCs) reveals the formation of a local moment with a net of one electron spin in the vicinity of the point contact—supporting the recent report of a Kondo effect in a QPC. The hybridization of the local moment to the leads decreases as the QPC becomes longer, while the on site Coulomb-interaction energy remains almost constant.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.026804
DOI:
10.1103/PhysRevLett.90.026804
PACS:
73.61.–r, 71.15.Mb, 71.70.Ej

*Permanent Address: Department of Physics, Ben-Gurion University, Beer Sheva 84105, Israel.

 
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