Thermoelectric and Seebeck coefficients of granular metals

Autor:	Glatz, Andreas, Beloborodov, I. S.
Rok vydání:	2009
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Disordered Systems and Neural Networks
Zdroj:	Phys. Rev. B 79, 235403 (2009)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.79.235403
Popis:	In this work we present a detailed study and derivation of the thermopower and thermoelectric coefficient of nano-granular metals at large tunneling conductance between the grains, g_T>> 1. An important criterion for the performance of a thermoelectric device is the thermodynamic figure of merit which is derived using the kinetic coefficients of granular metals. All results are valid at intermediate temperatures, E_c>>T/g_T>\delta, where \delta is the mean energy level spacing for a single grain and E_c its charging energy. We show that the electron-electron interaction leads to an increase of the thermopower with decreasing grain size and discuss our results in the light of future generation thermoelectric materials for low temperature applications. The behavior of the figure of merit depending on system parameters like grain size, tunneling conductance, and temperature is presented. Comment: 27 pages, 10 figures, revtex4
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0902.2482 Zobrazit plný text záznamu View this record from Arxiv