Observation of Higher Sub-band inn-Type (100) Si Inversion Layers

Abstract

We have observed population of the heavy-mass sub-band in $n$-type (100) Si inversion layers at an electron density of (7.4 ± 0.3) × ${10}^{12}$/${\mathrm{cm}}^2$, corresponding to an energy splitting of 46 meV. These data are inconsistent with results from recent self-consistent-field calculations and confirm that the many-body effects are important.