Thermoelectric effects in silicene nanoribbons

Krzysztof Zberecki , Michał Wierzbicki , J. Barnaś , Renata Świrkowicz

Abstract

Transport and thermoelectric coefficients (including also spin thermopower) of silicene nanoribbons with zigzag edges are investigated by ab initio numerical methods. Local spin density of such nanoribbons reveals edge magnetism. As in graphene, one finds antiferromagnetic and ferromagnetic ordering, with spin polarization at one edge antiparallel or parallel to that at the other edge, respectively. Thermoelectric properties, especially the Seebeck coefficient, significantly depend on the electronic band structure and are enhanced when the Fermi level is in the energy gap. However, the thermoelectric efficiency is significantly reduced when the phonon contribution to the heat conductance is included. This phonon contribution has been calculated numerically by two different methods. Transition from antiferromagnetic to ferromagnetic states leads to a large magnetoresistance as well as to a considerable magnetothermopower. Thermoelectric parameters in the antiparallel configuration, when spin polarization in the left part of the nanoribbon is opposite to that in the right part, are also analyzed. © 2013 American Physical Society.
Author Krzysztof Zberecki (FP / SRD)
Krzysztof Zberecki,,
- Structural Research Division
, Michał Wierzbicki (FP / SRD)
Michał Wierzbicki,,
- Structural Research Division
, J. Barnaś
J. Barnaś,,
-
, Renata Świrkowicz (FP / SRD)
Renata Świrkowicz,,
- Structural Research Division
Journal seriesPhysical Review B, ISSN 1098-0121
Issue year2013
Vol88
No11
Pages115404
ASJC Classification3104 Condensed Matter Physics; 2504 Electronic, Optical and Magnetic Materials
DOIDOI:10.1103/PhysRevB.88.115404
URL http://www.scopus.com/inward/record.url?eid=2-s2.0-84884830589&partnerID=40&md5=d47632abcfc594191a6143652596062b
LanguageEnglish
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 05-03-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 05-03-2020, ArticleFromJournal
Publication indicators WoS Citations = 74; GS Citations = 20.0; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.326; WoS Impact Factor: 2013 = 3.664 (2) - 2013=3.564 (5)
Citation count*20 (2015-02-04)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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