Dephasing in Metals by Two-Level Systems in the 2-Channel-Kondo Regime

Details Dephasing in Metals by Two-Level Systems in the 2-Channel-Kondo Regime Dephasing in Metals by Two-Level Systems in the 2-Channel-Kondo Regime

1999-02-11

arxiv.org/abs/cond-mat/9902176v2

Phys. Rev. Lett. 83, 2632 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

Final published version, including minor improvements suggested by referees. 4 pages, Revtex, 1 figure

Scientific paper

10.1103/PhysRevLett.83.2632

We point out a novel, non-universal contribution to the dephasing rate 1/\tau_\phi \equiv \gamma_\phi of conduction electrons in metallic systems: scattering off non-magnetic two-level systems (TLSs) having almost degenerate Kondo ground states. In the regime \Delta_{ren} < T < T_K (\Delta_{ren} = renormalized level splitting, T_K = Kondo temperature), such TLSs exhibit non-Fermi-liquid physics that can cause \gamma_\phi, which generally decreases with decreasing T, to seemingly saturate in a limited temperature range before vanishing for T \to 0. This could explain the saturation of dephasing recently observed in gold wires [Mohanty et al. Phys. Rev. Lett. 78, 3366 (1997)].

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