Theoretical description of time-resolved pump-probe photoemission in TaS 2: a single-band DFT DMFTNRG study within the quasiequilibrium approximation - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




Theoretical description of time-resolved pump-probe photoemission in TaS 2: a single-band DFT DMFTNRG study within the quasiequilibrium approximation - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: In this work, we theoretically examine recent pump-probe photoemissionexperiments on the strongly correlated charge-density-wave insulator TaS\ 2. Wedescribe the general nonequilibrium many-body formulation of time-resolvedphotoemission in the sudden approximation, and then solve the problem usingdynamical mean-field theory with the numerical renormalization group and a baredensity of states calculated from density functional theory including thecharge-density-wave distortion of the ion cores and spin-orbit couplingWe find a number of interesting results: i the bare band structure actuallyhas more dispersion in the perpendicular direction than in the two-dimensionalplanes; ii the DMFT approach can produce upper and lower Hubbard bands thatresemble those in the experiment, but the upper bands will overlap in energywith other higher energy bands; iii the effect of the finite width of theprobe pulse is minimal on the shape of the photoemission spectra; and iv thequasiequilibrium approximation does not fully describe the behavior in thissystem.



Author: J. K. Freericks, H. R. Krishnamurthy, Yizhi Ge, A. Y. Liu, Th. Pruschke

Source: https://arxiv.org/



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