Borda L, Zaránd G. Dynamics of a tunneling magnetic impurity: Kondo effect induced incoherence.
PHYSICAL REVIEW LETTERS 2002;
88:247203. [PMID:
12059329 DOI:
10.1103/physrevlett.88.247203]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2001] [Revised: 01/30/2002] [Indexed: 05/23/2023]
Abstract
We study how the formation of the Kondo compensation cloud influences the dynamical properties of a magnetic impurity that tunnels between two positions in a metal. The Kondo effect dynamically generates a strong tunneling impurity-conduction electron coupling, changes the temperature dependence of the tunneling rate, and may ultimately result in the destruction of the coherent motion of the particle at zero temperature. We find an interesting two-channel Kondo fixed point as well for a vanishing overlap between the electronic states that screen the magnetic impurity. We propose experiments where the predicted features could be observed.
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