Hybrid NRG-DMRG approach to real-time dynamics of quantum impurity systems
| Autor: | Fabian Güttge, U. Schollwöck, Eitan Eidelstein, Frithjof B. Anders, Avraham Schiller |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Discretization Density matrix renormalization group Numerical analysis FOS: Physical sciences Renormalization group Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Condensed Matter - Strongly Correlated Electrons Quadratic equation Quantum mechanics symbols Functional renormalization group Statistical physics Hamiltonian (quantum mechanics) Quantum |
| Popis: | A hybrid approach to nonequilibrium dynamics of quantum impurity systems is presented. The numerical renormalization group serves as a means to generate a suitable low-energy Hamiltonian, allowing for an accurate evaluation of the real-time dynamics of the problem up to exponentially long times using primarily the time-adaptive density-matrix renormalization group. We extract the decay time of the interaction-enhanced oscillations in the interacting resonant-level model and show their quadratic divergence with the interaction strength U. Our numerical analysis is in excellent agreement with analytic predictions based on an expansion in 1/U. 5 pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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