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- Ludwig-Maximilians-Universität MünchenDE112 papers
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6 papers · 2 filters
Quantum quenches from integrability: the fermionic pairing model
Alexandre Faribault, Pasquale Calabrese, Jean-Sebastien Caux
Understanding the non-equilibrium dynamics of extended quantum systems after the trigger of a sudden, global perturbation (quench) represents a daunting challenge, especially in th…
Unitary perturbation theory approach to real-time evolution problems
A. Hackl, S. Kehrein
We discuss a new analytical approach to real-time evolution in quantum many-body systems. Our approach extends the framework of continuous unitary transformations such that it amou…
Density matrix renormalization group study of a quantum impurity model with Landau-Zener time-dependent Hamiltonian
Cheng Guo, Andreas Weichselbaum, Stefan Kehrein +2
We use the adaptive time-dependent density matrix renormalization group method (t-DMRG) to study the nonequilibrium dynamics of a benchmark quantum impurity system which has a time…
Kondo decoherence: finding the right spin model for iron impurities in gold and silver
T. A. Costi, L. Bergqvist, A. Weichselbaum +8
We exploit the decoherence of electrons due to magnetic impurities, studied via weak localization, to resolve a longstanding question concerning the classic Kondo systems of Fe imp…
Electrostatic modification of infrared response in gated structures based on VO2
M. M. Qazilbash, Z. Q. Li, V. Podzorov +5
We investigate the changes in the infrared response due to charge carriers introduced by electrostatic doping of the correlated insulator vanadium dioxide (VO2) integrated in the a…
Matrix product state comparison of the numerical renormalization group and the variational formulation of the density matrix renormalization group
Hamed Saberi, Andreas Weichselbaum, Jan von Delft
Wilson's numerical renormalization group (NRG) method for solving quantum impurity models yields a set of energy eigenstates that have the form of matrix product states (MPS). Whit…