Large Coulomb gap in the spectrum of localized states of Mn in amorphous Si
Dvurechenskii A. V., Ryazantsev I. A., Dravin V. A., Yakimov A. I.
A Coulomb gap Δ has been detected in the energy spectrum of the localized states of Mn in amorphous Si near the metal-insulator transition. This gap was determined from the temperature dependence of the conductivity within the context of a theory developed by Shklovskii and Efros. The value of Δ was found to be more than an order of magnitude larger than the values found previously for semiconductor-impurity systems with shallow levels.