Abstract
The electron momentum density (EMD) in liquid silicon (Si) has been measured by synchrotron-based Compton scattering. The observed variation in the valence EMD upon melting, reflecting a semiconductor-metal transition of Si, is well explained by the collapse of the Jones zone of crystalline Si. However, the shape of the EMD of liquid Si is considerably broad and retains fairly solid ($\ensuremath{\alpha}$-Si)-like characteristics. The analysis of the Fourier-transformed Compton profiles reveals that the valence electronic state in liquid Si exhibits a marked deviation from the free-electron gas features.
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