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Diameter and Temperature Dependences of Phonon-Drag Magnetothermopower in Bismuth Nanowires

Published online by Cambridge University Press:  18 January 2013

Naomi Hirayama
Affiliation:
Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510 Japan
Akira Endo
Affiliation:
Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
Naomichi Hatano
Affiliation:
Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
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Abstract

We present theoretical calculations of the phonon-drag contribution to the Nernst thermoelectric power S yx in Bismuth nanowires. We investigate the thermopower S yx with diameters L ranging from 22 to 900 nm at low temperatures (0.1 - 4.0 K) and high magnetic fields (up to 16 T). We find that the peak of thermopower S yx around 14.75 T exhibits the size effect in two different ways: for wires with L≥200 nm, the peak height increases with decreasing L; for wires with L<200 nm, on the other hand, the peak height rapidly decreases with decreasing L. The dependence is accounted for by considering the contributions of discrete quantized phonon modes. We also discuss the temperature dependence of S yx .

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Copyright
Copyright © Materials Research Society 2013 

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References

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Diameter and Temperature Dependences of Phonon-Drag Magnetothermopower in Bismuth Nanowires
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