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

Article

关键词: T-C SUPERCONDUCTORS;    TOPOLOGICAL ORDER;    VORTEX CORES;    SPIN;    LIMIT;    LIQUID;    MODEL;    BI2SR2CACU2O8+DELTA;    FRACTIONALIZATION;    CONFINEMENT;   

DOI  :  10.1103/PhysRevB.66.100505

来源: SCIE

【 摘 要 】

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 chiral symmetry breaking are also discussed.

【 授权许可】

Free