Screening of the Coulomb interaction in two-dimensional variable-range hopping
- 15 July 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 56 (3), 1161-1169
- https://doi.org/10.1103/physrevb.56.1161
Abstract
A Coulomb gap in the density of states is inferred from variable-range-hopping measurements in two dimensions in a gated GaAs/Al heterostructure. For large hopping lengths the Coulomb interaction is screened by a metallic gate, and a universal crossover to Mott hopping at low temperatures is observed. Excellent agreement with theory is achieved by adjusting a single combination of constants associated with variable-range hopping. This change in constants is explained by correlated hopping. The Coulomb interaction is not screened by the two-dimensional electron layer.
Keywords
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