Volume 62, Number 2, April 2003
|Page(s)||264 - 270|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 April 2003|
Parity-dependent Kondo effect in ultrasmall metallic grains
SMC-INFM and Dipartimento di Fisica, Università “La
Sapienza” P.le A. Moro 2, I-00185 Roma, Italy
2 INFM and Dipartimento di Ingegneria dell'Informazione Seconda Università di Napoli - I-81031, Aversa (Na), Italy
3 NEST-INFM and Dipartimento di Fisica “E. Amaldi”, Università di Roma Tre Via della Vasca Navale 84, I-00146 Roma, Italy
4 NEST-INFM and Scuola Normale Superiore - I-56126 Pisa, Italy
Accepted: 18 February 2003
In this letter we study the Kondo effect in an ultrasmall metallic grain, i.e. small enough to have a discrete energy-level spectrum, by calculating the susceptibility χ of the magnetic impurity. Our quantum Monte Carlo simulations, and analytic solution of a simple model, show that the behavior changes dramatically depending on whether the number of electrons in the grain is even or odd. We suggest that the measurements of χ provide an effective experimental way of probing the grain's number parity.
PACS: 75.75.+a – Magnetic properties of nanostructures / 73.63.-b – Electronic transport in mesoscopic or nanoscale materials and structures
© EDP Sciences, 2003
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