Journal Article

FZJ-2017-06988

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Time Evolution of the Kondo Resonance in Response to a Quench

Nghiem, H.FZJ* ; Costi, T. (Corresponding author)FZJ*

2017
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/15612  doi:10.1103/PhysRevLett.119.156601

Abstract: We investigate the time evolution of the Kondo resonance in response to a quench by applying the time-dependent numerical renormalization group (TDNRG) approach to the Anderson impurity model in the strong correlation limit. For this purpose, we derive within the TDNRG approach a numerically tractable expression for the retarded two-time nonequilibrium Green function G(t+t′,t), and its associated time-dependent spectral function, A(ω,t), for times t both before and after the quench. Quenches from both mixed valence and Kondo correlated initial states to Kondo correlated final states are considered. For both cases, we find that the Kondo resonance in the zero temperature spectral function, a preformed version of which is evident at very short times t→0+, only fully develops at very long times t≳1/TK, where TK is the Kondo temperature of the final state. In contrast, the final state satellite peaks develop on a fast time scale 1/Γ during the time interval −1/Γ≲t≲+1/Γ, where Γ is the hybridization strength. Initial and final state spectral functions are recovered in the limits t→−∞ and t→+∞, respectively. Our formulation of two-time nonequilibrium Green functions within the TDNRG approach provides a first step towards using this method as an impurity solver within nonequilibrium dynamical mean field theory.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (IAS-3)
2. Theoretische Nanoelektronik (PGI-2)
3. JARA - HPC (JARA-HPC)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)
2. Thermoelectric properties of molecular quantum dots and time-dependent response of quantum dots (jiff23_20140501) (jiff23_20140501)
3. Density functional calculations with molecular dynamics -- amorphous and crystalline materials (jiff05_20170501) (jiff05_20170501)

Appears in the scientific report 2017

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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