Girvin, Yang Modern Condensed Matter Physics 2019 SSP · Problem 20.9

Microscopic Theory of Superconductivity

Physics — Condensed Matter · cuprate-superconductors-nodal-quasiparticles

Problem

Assume that the Fermi velocity at the node K⃗\vec{K} is vFv_F and ΔK⃗+δk⃗=vg(e^⋅δk⃗)\Delta_{\vec{K}+\delta\vec{k}} = v_g(\hat{e} \cdot \delta\vec{k}), where e^\hat{e} is the unit vector parallel to the Fermi surface at K⃗\vec{K}. Calculate the contribution to the low-temperature specific heat from this node.

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