| Issue |
Europhys. Lett.
Volume 67, Number 4, August 2004
|
|
|---|---|---|
| Page(s) | 634 - 640 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10090-0 | |
| Published online | 01 August 2004 | |
On the magnetic nature of quantum point contacts
Instituto Balseiro and Centro Atómico Bariloche Comisión Nacional de Energía Atómica 8400 San Carlos de Bariloche, Río Negro, Argentina
Received:
26
January
2004
Accepted:
7
June
2004
We present results for a model that describes a quantum point
contact. We show how electron-electron correlations, within the
unrestricted Hartree-Fock approximation, generate a magnetic
moment in the point contact. Having characterized the magnetic
structure of the contact, we map the problem onto a simple
one-channel model and calculate the temperature dependence of the
conductance for different gate voltages. Our results are in good
agreement with experimental results obtained in 
devices and support the idea of Kondo effect in these systems.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 75.75.+a – Magnetic properties of nanostructures
© EDP Sciences, 2004
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