Finite temperature spectral function of a hole in a quantum antiferromagnet and role of phonons - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: We study thermal broadening of the hole spectral function of thetwo-dimensional t-J model and its extensions within the non-crossingapproximation with and without the contribution of optical phonons. We findthat phonons at finite temperature broaden the lowest energy quasiparticlepeak, however, the string excitations survive even for relatively strongelectron-phonon coupling. Experimental angle resolved photo-emissionspectroscopyARPES results compare well with our calculations at finitetemperature when we use strong electron-phonon coupling without any adhocbroadening. In addition, we have studied the role of vertex corrections and wefind that their contribution allows us achieve the same overall agreement withthe ARPES experimental results but using smaller values for the electron-phononcoupling.



Author: Satyaki Kar, Efstratios Manousakis

Source: https://arxiv.org/







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