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Behavior of thermopower of graphene in Bloch–Grüneisen regime
Author(s) -
Sankeshwar N. S.,
Vaidya R. G.,
Mulimani B. G.
Publication year - 2013
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201248302
Subject(s) - condensed matter physics , seebeck coefficient , graphene , phonon , electron , merge (version control) , materials science , phonon drag , electron mobility , physics , thermal conductivity , thermodynamics , quantum mechanics , information retrieval , computer science
Thermopower (TP), S of pure graphene in the Bloch–Grüneisen (BG) regime is investigated assuming electrons to be scattered by in‐plane acoustic phonons and taking into account the temperature dependent effects arising from thermal averaging over carrier energy. Numerical calculations of electron mobility and TP show a signature of BG regime. The mobility is found to increase rapidly with decrease in temperature. The diffusion component S d of TP is found to follow a non‐linear temperature dependence showing changes in sign before becoming linear at very low temperatures; this is in contrast to the usual linear dependence reported in literature. At higher temperatures S d , as does mobility, is found to merge with values calculated using equipartition approximation. The influence of phonon drag contribution S g on the total TP, S , is also investigated. A fairly good agreement with existing low temperature data is obtained. Detailed analysis of TP data in pure samples will enable better understanding of the electron–phonon interaction in graphene.