Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-11-18
Phys.Rev. B67 (2003) 144509
Physics
Condensed Matter
Strongly Correlated Electrons
32 pages, RevTeX4, 17 EPS figures; final version published in PRB
Scientific paper
10.1103/PhysRevB.67.144509
We derive the electrical and thermal conductivities of the $d$-density-wave state in an external magnetic field $B$ in the low-temperature regime and in the presence of impurities. We show that in the zero-temperature limit, $T \to 0$, the Wiedemann-Franz (WF) law remains intact irrespectively of the value of the applied field and chemical potential $\mu$ as soon as there is a scattering from impurities. For finite $T \lesssim |\mu|$ the WF law violation is possible and it is enhanced by the external field. Depending on the relative values of $B$ and $T$ the electrical conduction may dominate the heat conduction and vice versa. For $\mu \gg T$ the WF is restored even in the presence of the external field.
Beck Hans
Gusynin Valery P.
Sharapov Sergei G.
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