| Автор | G Qin |
| Автор | T M Fromhold |
| Автор | P N Butcher |
| Автор | B G Mulimani |
| Автор | J P Oxley |
| Автор | B L Gallagher |
| Дата выпуска | 1993-03-01 |
| dc.description | The phonon drag and electronic diffusion contributions to the tensor M which determines the heat flux U=M.E is calculated for a two-dimensional electron gas in a perpendicular magnetic field B. The drag component is obtained using Boltzmann transport and diffusion is included using the lowest-order cumulant approximation to describe scattering between Landau states with different orbit centres. The 2D Landau levels have Gaussian model lineshapes with RMS width gamma =CB<sup>1/2</sup> which is the only adjustable parameter. At temperature T=5.02 K, drag dominates the predicted M<sub>yx</sub>(B) values which are in good agreement with new data for Si MOSFETs taking C=0.6 meV T<sup>-1</sup>2/. The calculated M<sub>xx</sub> values are in worse accord with the data because the predicted drag contribution M<sub>xx</sub><sup>g</sup> is zero. Both M<sub>xx</sub> and M<sub>yx</sub> reveal magneto-oscillations originating from fluctuations in the density of states at the Fermi level. The authors show that at T=5.02 K, setting M<sub>xx</sub><sup>g</sup>=0 has little effect on the accuracy of the magnetothermopower S<sub>xx</sub>(B) but yields poor approximations to the off-diagonal term S<sub>yx</sub>(B). At T=1.47 K, these thermopower components are diffusion-dominated. The predicted values are comparable to experiment although the magneto-oscillations are overemphasized in S<sub>yx</sub> and underestimated in S<sub>xx</sub>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Magnetothermopower in silicon MOSFETs |
| Тип | paper |
| DOI | 10.1088/0953-8984/5/9/020 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 5 |
| Первая страница | 1355 |
| Последняя страница | 1364 |
| Аффилиация | G Qin; Dept. of Phys., Warwick Univ., Coventry, UK |
| Аффилиация | T M Fromhold; Dept. of Phys., Warwick Univ., Coventry, UK |
| Аффилиация | P N Butcher; Dept. of Phys., Warwick Univ., Coventry, UK |
| Аффилиация | B G Mulimani; Dept. of Phys., Warwick Univ., Coventry, UK |
| Аффилиация | J P Oxley; Dept. of Phys., Warwick Univ., Coventry, UK |
| Аффилиация | B L Gallagher; Dept. of Phys., Warwick Univ., Coventry, UK |
| Выпуск | 9 |
