Raman response of the charge density wave in cuprate superconductors
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Universidade Federal de Minas Gerais
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We study the Raman response, for B1g and B2g light-polarization symmetries, of the charge density wave phase appearing in the underdoped region of cuprate superconductors. We show that the B2g response provides a distinctive signature of the charge order, independently of the details of the electronic structure and from the concomitant presence of a pseudogap, in sharp contrast with the behavior of the B1g response. This well accounts for the Raman experimental results. We then clearly identify a charge density wave energy scale, and show that its doping dependence is eventually driven by the monotonic behavior of the pseudogap. This has also been pointed out in Raman experiments, and it is suggestive of a pseudogap ruling the multiple energy scales of the exotic phases appearing in the cuprate phase diagram.
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Charge density waves, Electronic structure, High-temperature superconductors, Superconductivity, Path integrals
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https://journals.aps.org/prb/pdf/10.1103/PhysRevB.108.165111