Phys. Rev. Lett. 96, 176802 (2006) [4 pages]Spectroscopy of the Kondo Problem in a BoxReceived 13 January 2006; published 3 May 2006 Motivated by experiments on double quantum dots, we study the problem of a single magnetic impurity confined in a finite metallic host. We prove an exact theorem for the ground state spin, and use analytic and numerical arguments to map out the spin structure of the excitation spectrum of the many-body Kondo-correlated state, throughout the weak to strong coupling crossover. These excitations can be probed in a simple tunneling-spectroscopy transport experiment; for that situation we solve rate equations for the conductance. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.176802
DOI:
10.1103/PhysRevLett.96.176802
PACS:
73.23.Hk, 72.10.Fk, 73.21.La
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