Physics – Condensed Matter
Scientific paper
2001-09-26
Phys. Stat. Sol. (b) 230, 189 (2002).
Physics
Condensed Matter
Proc. of 9th conference "Hopping and related phenomena", Shefaim, Israel, September 2001
Scientific paper
It is shown that the voltage dependence of the tunneling conductance between two lightly doped semiconductors, which are separated by an large area tunneling barrier, can reveal the high energy part of the Coulomb gap if the barrier is thick enough. At the barrier thickness smaller than average distance between impurities no Coulomb gap feature can be found. This happens because such tunneling is sensitive to very rare shortest pairs of occupied and empty states localized at opposite sides of the barrier, whose density of states in this limit has no Coulomb gap. Small area tunneling contacts are also discussed. It is shown that the tunneling conductance of a point-like contact exponentialy grows with the applied voltage. This dependence does not permit a direct measurement of the Coulomb gap, but indirectly has information about it.
Larkin Anatoly I.
Shklovskii Boris I.
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