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Phonon drag thermopower in an AlGaN/GaN heterostructure by S. S. Kubakaddi is a Physics and Astronomy article available to read on EtoBox.
What is Phonon drag thermopower in an AlGaN/GaN heterostructure about?
## Abstract The theoretical thermopower of a two‐dimensional electron gas (2DEG) is studied in a clean AlGaN/GaN heterostructure of zincblende (ZB) and wurtzite (WZ) symmetry over the temperature range 0.1–10 K. The phonon drag thermopower (__S__^g^) due to 2DEG coupling with 3D longitudinal and transverse acoustic phonons is calculated for high‐density electrons. It is found that, in both ZB and WZ symmetries, the __S__^g^ due to piezoelectrically coupled transverse acoustic phonons is dominant over the __S__^g^ due to longitudinal acoustic phonons via piezoelectric and deformation potential coupling over the entire temperature range. This dominance is attributed to the pronounced piezoelectricity of nitrides and the smaller velocity of transverse acoustic phonons. It is shown that the total __S__^g^ ∼ __T^n^__ with __n__ = 3.8 at temperatures __T__ < 2.0 K and is close to __n__ = 4 in the Bloch–Gruneisen limit. Diffusion thermopower (__S__^d^) is also presented and is found to be significant for __T__ below 0.4 K. The calculations are compared with the results for GaAs/GaAlAs heterostructures.
Who reads Phonon drag thermopower in an AlGaN/GaN heterostructure?
It is typically read by researchers, students, and practitioners in Physics and Astronomy.
- Author
- S. S. Kubakaddi
- Publisher
- John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0370-1972)
- Published
- 2003
- Language
- EN
- Field
- Physics and Astronomy (Physical Sciences)