Abstract
Electron-spin-resonance (ESR) data obtained from modulation-doped ${\mathrm{S}\mathrm{i}/\mathrm{S}\mathrm{i}}_{1\ensuremath{-}y}{\mathrm{C}}_{y}$ heterostructures are reported. The observed signals show that the small number of electron spins in these two-dimensional structures is still sufficient to detect ESR directly, and we have strong indications that the prominent line in the spectra is due to conduction electrons confined in the ${\mathrm{Si}}_{1\ensuremath{-}y}{\mathrm{C}}_{y}$ layers, forming a two-dimensional electron gas. We compare our results to the case of confined electrons in III-V heterostructures and quantum wells, where only indirectly detected ESR experiments have been reported so far.
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