Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-02-11
Physics
Condensed Matter
Disordered Systems and Neural Networks
10 pages, 7 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.60.1582
Electron tunneling experiments are used to probe Coulomb correlation effects in the single-particle density-of-states (DOS) of boron-doped silicon crystals near the critical density of the metal-insulator transition (MIT). At low energies, a DOS measurement distinguishes between insulating and metallic samples with densities 10 to 15 % on either side of the MIT. However, at higher energies the DOS of both insulators and metals show a common behavior, increasing roughly as the square-root of energy. The observed characteristics of the DOS can be understood using a classical treatment of Coulomb interactions combined with a phenomenological scaling ansatz to describe the length-scale dependence of the dielectric constant as the MIT is approached from the insulating side.
Lee Mark
Massey J. G.
Nguyen Van Lien
Shklovskii Boris I.
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