2013/07/21 by M. V. Medvedyeva, M. Medvedyeva, Axel Hoffmann +3 · 43 citations
Physics and Astronomy · #Anderson impurity model #Causality (physics) #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Impurity #Kondo effect #Kondo model #Magnetic impurity #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum entanglement #Quantum mechanics #Spin (aerodynamics) #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.88.094306
published in Physical Review B 88(9) (American Physical Society) · 10 pages, 9 figures
arxiv created 2013/07/21 · openalex publication_date 2013/09/17 · arxiv updated 2013/09/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate how the Kondo screening cloud builds up as a function of space and time. Starting from an impurity spin decoupled from the conduction band, the Kondo coupling is switched on at time t=0. We work at the Toulouse point where one can obtain exact analytical results for the ensuing spin dynamics at both zero and nonzero temperature T. For t>0 the Kondo screening cloud starts building up in the wake of the impurity spin being transported to infinity. In this buildup process the impurity spin--conduction band spin susceptibility shows a sharp light cone due to causality, while the corresponding correlation function has a tail outside the light cone. At T=0 this tail has a power-law decay as a function of distance from the impurity, which we interpret as due to initial entanglement in the Fermi sea.