Abstract
We present a theoretical framework for a quantitative understanding of the full doping dependence of the optical spectra of the cuprates. In accord with experimental observations, the computed spectra show how the high-energy charge-transfer (CT) gap features persist in the overdoped regime even after the midinfrared (MIR) peak originating from the pseudogap has collapsed in a quantum critical point. In this way, we reconcile the opposing tendencies of the MIR and CT peaks to shift in opposite directions in the optical spectra with increasing doping. The competition between the pseudogap and the CT gap also results in rapid loss of spectral weight in the high energy region with doping.
Keywords
optical model solution, doping dependence, high energy charge transfer gap, midinfrared peak, pseuodogap, CT gap, cuprates
Subject Categories
Superconductors
Disciplines
Physics
Publisher
American Physical Society
Publication Date
5-5-2010
Rights Information
Copyright 2010 American Physical Society.
Rights Holder
American Physical Society
Recommended Citation
Das, Tanmoy; Markiewicz, R. S.; and Bansil, A., "Optical model-solution to the competition between a pseudogap phase and a charge-transfer-gap phase in high-temperature cuprate superconductors" (2010). Physics Faculty Publications. Paper 409.
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Notes
Originally published in Physical Review B v.81 (2010): 174504. DOI: 10.1103/PhysRevB.81.174504