Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.266601
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Funding
- NSF [DMR-1006605]
- Croatian MZOS [0035-0352843-2849]
- McDevitt bequest at Georgetown University
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006605] Funding Source: National Science Foundation
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We show how a lightly doped Mott insulator has hugely enhanced electronic thermal transport at low temperature. It displays universal behavior independent of the interaction strength when the carriers can be treated as nondegenerate fermions and a nonuniversal crossover'' region where the Lorenz number grows to large values, while still maintaining a large thermoelectric figure of merit. The electron dynamics are described by the Falicov-Kimball model which is solved for arbitrary large on-site correlation with a dynamical mean-field theory algorithm on a Bethe lattice. We show how these results are generic for lightly doped Mott insulators as long as the renormalized Fermi liquid scale is pushed to very low temperature and the system is not magnetically ordered. DOI: 10.1103/PhysRevLett.109.266601
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