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Part 1. The thermal Hall conductivity.
[Top left inset] A quadrant of the Fermi Surface FS of YBCO, showing one of the 4 gap nodes and a quasiparticle energy contour (red oval) near the node.
[Top right inset] Sketch of the anisotropic Dirac cone (plot of qp energy
E
(
q
) versus q1 and q2). The red arrow indicates an energy contour.
[Bottom Panel] An applied temperature gradient (left to right) produces a qp entropy current (red circle) and a phonon current. In the presence of vortices (green rings), the qp's suffer skew scattering to produce a Hall-thermal current, whereas the phonons are unaffected. By measuring
k
xy, one may selectively detect the qp current in the presence of a large phonon current.
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