Chiral symmetry breaking and violation of the Wiedemann-Franz law in underdoped cuprates

Details Chiral symmetry breaking and violation of the Wiedemann-Franz law in underdoped cuprates Chiral symmetry breaking and violation of the Wiedemann-Franz law in underdoped cuprates

2002-03-04

arxiv.org/abs/cond-mat/0203048v3

Phys. Rev. B 66, 100505 (2002)

Physics

Condensed Matter

Superconductivity

13 pages, no figures

Scientific paper

10.1103/PhysRevB.66.100505

We propose that the recently observed violation of the Wiedemann-Franz law in the normal state of underdoped cuprates is caused by spin-charge separation and dynamical chiral symmetry breaking in a (2+1)-dimensional system consisting of massless Dirac fermions, charged bosons and a gauge field. While the d-wave spinon gap vanishes at the Fermi points, the nodal fermions acquire a finite mass due to strong gauge fluctuations. This mass provides a gap below which no free fermions can be excited. This implies that there is not a residual linear term for the thermal conductivity, in good agreement with experiments. Other physical implications of the CSB are also discussed.

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