Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-09-04
Phys.Rev.Lett. 84 (2000) 3938
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final, substantially modified version of the article. Accepted for publication in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.84.3938
We study a generic model of interacting fermions in a finite-sized disordered system. We show that the off-diagonal interaction matrix elements induce density of states fluctuations which generically favor a minimum spin ground state at large interaction amplitude, $U$. This effect competes with the exchange effect which favors large magnetization at large $U$, and it suppresses this exchange magnetization in a large parameter range. When off-diagonal fluctuations dominate, the model predicts a spin gap which is larger for odd-spin ground states as for even-spin, suggesting a simple experimental signature of this off-diagonal effect in Coulomb blockade transport measurements.
Jacquod Philippe
Stone Douglas A.
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