Quasiparticle interference in the pseudogap phase of cuprate ...

QP INTERFERENCE 16
This theory describes fermionic
excitations in a phase-disordered
d-wave superconductor. The electron
propagator reads
QED 3
[Franz and Tešanović, PRL 87, 257003 (2001)]
G 0 (k, iω) = λ −η iω + ɛ k σ 3
[ω 2 + ɛ 2 k + ∆2 k ]1−η/2,
where λ is a high energy cutoff
and η is the anomalous dimension
exponent which encodes the physics
of phase fluctuations. η is a small
positive number, whose precise value
is still under debate.
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