Nonequilibrium dynamics in a two-channel Kondo system due to a quantum quench

Abstract

Recent experiments by Potok et al. have demonstrated a remarkable tunability between a single-channel Fermi liquid fixed point and a two-channel non-Fermi liquid fixed point. Motivated by this we study the nonequilibrium dynamics due to a sudden quench of the parameters of a Hamiltonian from a single-channel to a two-channel anisotropic Kondo system. We find a distinct difference between the long time behavior of local quantities related to the impurity spin as compared to that of bulk quantities related to the total (conduction electrons + impurity) spin of the system. In particular, the local impurity spin and the local spin susceptibility are found to equilibrate, but in a very slow power-law fashion which is peculiar to the non-Fermi liquid properties of the Hamiltonian. In contrast, we find a lack of equilibration in the two particle expectation values related to the total spin of the system.

5 pages, 1 fig. Accepted in PRB

References in corpus (6)

• Observation of the two-channel Kondo effect
• Quantum transport through a Tonks-Girardeau gas
• Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot
• Universal Scaling of Nonequilibrium Transport in the Kondo Regime of Single Molecule Devices
• Transient dynamics of the nonequilibrium Majorana resonant level model
• Kondo polarons in a one-dimensional Fermi gas

Cited by in corpus (5)

• Voltage quench dynamics of a Kondo system
• Anderson impurity model in nonequilibrium: analytical results versus quantum Monte Carlo data
• Interaction quench dynamics in the Kondo model in presence of a local magnetic field
• Dynamics of the impurity screening cloud following quantum quenches of the Resonant Level Model
• Ballistic Entanglement Cloud after a Boundary Quench