Nodal quasiparticle dispersion in strongly correlated d-wave superconductors

Mohit Randeria; Arun Paramekanti; Nandini Trivedi

doi:10.1103/PhysRevB.69.144509

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Nodal quasiparticle dispersion in strongly correlated d-wave superconductors

Mohit Randeria, Arun Paramekanti, Nandini Trivedi

DOI 10.1103/PhysRevB.69.144509 · Physical Review B

T1

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Abstract

We analyze the effects of a k-dependent self-energy on the photoemission momentum distribution curve (MDC) line shape and dispersion and, in particular, show that this modifies the “high-energy” dispersion vFhigh of the MDC’s in an essential way. These general results are illustrated by a detailed examination of nodal quasiparticles in the superconducting state of the high-Tc cuprates. Using variational results for the nodal quasiparticle weight Z, which vanishes with the hole doping x, and the low energy dispersion vFlow, which is independent of x, we show that the “high-energy” dispersion vFhigh=vFlow/Z is much larger than the band structure value and exhibits a striking doping dependence in good agreement with recent data. These results provide strong evidence for an electronic origin of all the nodal dispersion anomalies, including the much-studied kink.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2212 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	onset