Bipolar thermoelectric effects in semiconducting carbon nanotubes: Description in terms of one-dimensional Dirac electrons

Abstract

The thermoelectric effects in semiconducting single-walled carbon nanotubes (SWCNTs) are investigated based on the linear response theory combined with the thermal Green's function method. It is shown that the electronic states near the lowest conduction band minimum and the highest valence band maximum can be effectively described in terms of one-dimensional (1D) Dirac electrons to which a theoretical scheme is developed to describe the thermoelectric responses making it possible to study the effects of inter-band impurity scattering and in-gap states. Using the proposed scheme, the bipolar thermoelectric effects (i.e., the sign inversion of the Seebeck coefficient) in semiconducting SWCNTs observed in recent experiments are explained. Moreover, the temperature dependence of the Seebeck coefficient of semiconducting SWCNTs at low temperature is clarified.

14 pages, 16 figures

References in corpus (5)

• Giant Seebeck coefficient in semiconducting single-wall carbon nanotube film
• Diameter dependence of thermoelectric power of semiconducting carbon nanotubes
• Effects of Defects on Thermoelectric Properties of Carbon Nanotubes
• Possible High Thermoelectric Power in Semiconducting Carbon Nanotubes ~A Case Study of Doped One-Dimensional Semiconductors~
• Enhanced thermoelectric performance of carbon nanotubes at elevated temperature

Cited by in corpus (9)

• Comparative first-principles study of antiperovskite oxides and nitrides as thermoelectric material: multiple Dirac cones, low-dimensional band dispersion, and high valley degeneracy
• Optimal Thermoelectric Power Factor of Narrow-Gap Semiconducting Carbon Nanotubes with Randomly Substituted Impurities
• Thermoelectric Effect in Mott Variable-Range Hopping
• First-principles study of LaOPbBiS${}_3$ and its analogous compounds as thermoelectric materials
• Effect of Coulomb Interaction on Seebeck Coefficient of Organic Dirac Electron System $\alpha$-(BEDT-TTF)${}_2$I${}_3$
• Two-band Model with High Thermoelectric Power Factor and Its Application to FeSe Thin Film
• Theory of Phason Drag Effect on Thermoelectricity
• Seebeck Coefficient of Two-dimensional Dirac Electrons in Organic Conductor under Pressure
• Sommerfeld-Bethe analysis of ZT in inhomogeneous thermoelectrics