Dragosavac, M., Paul, D.J. , Pepper, M., Fowler, A.B. and Buchanan, D.A. (2005) Electron effective mass enhancement in ultrathin gate-oxide Si-MOSFETs. In: 27th International Conference on the Physics of Semiconductors - ICPS-27, Flagstaff, AZ, USA, 26-30 Jul 2004, pp. 495-496. (doi: 10.1063/1.1994200)
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Abstract
The effective mass (m*) of two‐dimensional electrons in Si‐MOSFETs, obtained from measurements of the thermal damping of Shubnikov‐de Haas oscillations, has been studied as a function of electron density for samples with physical gate‐oxide thicknesses of 4.7 nm and 3.1 nm. The electron‐electron interaction‐driven enhancement of m* in both thin‐oxide samples is well described by m*/mb = 0.96 + γrs, where mb is the bare band mass within the plane of confinement, and γ is a constant. Although the results from both sets of samples are in good quantitative agreement with previous experiments on thicker‐oxide MOSFETs, a small but significant difference in γ between the thin‐oxide samples was observed. We speculate that the experiments could provide evidence of a reduction in the mass enhancement due to the screening effect of the gate. The response of m* to changes in the confining potential for the two‐dimensional electron system is also investigated.
Item Type: | Conference Proceedings |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Paul, Professor Douglas |
Authors: | Dragosavac, M., Paul, D.J., Pepper, M., Fowler, A.B., and Buchanan, D.A. |
College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
Research Group: | Semiconductor Devices |
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