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19 papers · 1 filter
Spectral functions in one-dimensional quantum systems at T>0
Thomas Barthel, Ulrich Schollwöck, Steven R. White
We present for the first time time-dependent density-matrix renormalization-group simulations (t-DMRG) at finite temperatures. It is demonstrated how a combination of finite-temper…
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…
A real-time study of diffusive and ballistic transport in spin-1/2 chains using the adaptive time-dependent density matrix renormalization group method
S. Langer, F. Heidrich-Meisner, J. Gemmer +2
Using the adaptive time-dependent density matrix renormalization group method, we numerically study the spin dynamics and transport in one-dimensional spin-1/2 systems at zero temp…
Electron correlations in CoMnFeSi Heusler compounds
S Chadov, G. H. Fecher, C. Felser +3
This study presents the effect of local electronic correlations on the Heusler compounds CoMnFeSi as a function of the concentration . The analysis has been perf…
Effect of chemical disorder on NiMnSb investigated by Appearance Potential Spectroscopy: a theoretical study
J Minár, J Braun, S Bornemann +2
The half-Heusler alloy NiMnSb is one of the local-moment ferromagnets with unique properties for future applications. Band structure calculations predict exclusively majority bands…
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…