Interacting quantum dot coupled to a Kondo spin: A universal hamiltonian study

Stefan Rotter, Hakan E. Türeci, Y. Alhassid, A. Douglas Stone

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Abstract

We study a Kondo spin coupled to a mesoscopic interacting quantum dot that is described by the "universal Hamiltonian." The problem is solved numerically by diagonalizing the system Hamiltonian in a good-spin basis and analytically in the weak and strong Kondo coupling limits. The ferromagnetic exchange interaction within the dot leads to a stepwise increase of the ground-state spin (Stoner staircase), which is modified nontrivially by the Kondo interaction. We find that the spin-transition steps move to lower values of the exchange coupling for weak Kondo interaction, but shift back up for sufficiently strong Kondo coupling. The interplay between Kondo and ferromagnetic exchange correlations can be probed with experimentally tunable parameters.

Original languageEnglish (US)
Article number166601
JournalPhysical review letters
Volume100
Issue number16
DOIs
StatePublished - Apr 24 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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