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Resonant thermoelectric transport in atomic chains with Fano defects

Published online by Cambridge University Press:  02 May 2018

J. Eduardo González
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico
Vicenta Sánchez
Affiliation:
Departamento de Física, Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico
Chumin Wang
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico
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Abstract

Atomic clusters attached to a low-dimensional system, called Fano defects, produce rich wave interferences. In this work, we analytically found an enhanced thermoelectric figure-of-merit (ZT) in periodic atomic chains with Fano defects, compared with those without such defects. We further study self-assembled DNA-like systems with periodic and quasiperiodically placed Fano defects by using a real-space renormalization method developed for the Kubo–Greenwood formula, in which tight-binding and Born models are respectively used for the electric and lattice thermal conductivities. The results reveal that the quasiperiodicity could be another ZT-improving factor, whose long-range disorder inhibits low-frequency acoustic phonons insensitive to local defects.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2018 

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