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
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 …