Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-11-10
Phys. Rev. Lett. 92, 216601 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures. Recent references and new title added in published version
Scientific paper
10.1103/PhysRevLett.92.216601
We study a model proposed recently in which a small quantum dot is coupled symmetrically to several large quantum dots characterized by a charging energy E_c. Even if E_c is much smaller than the Kondo temperature T_K, the long-ranged interactions destabilize the single-channel Kondo effect and induce a flow towards a multi-channel Kondo fixed point associated with a rise of the impurity entropy with decreasing temperature. Such an ``uphill flow'' implies a negative impurity specific heat, in contrast to all systems with local interactions. An exact solution found for a large number of channels allows us to capture this physics and to predict transport properties.
Florens Serge
Rosch Achim
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