Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-05-21
Phys. Rev. B 77, 115301 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final Version. To appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.115301
Coulomb drag experiments in which the inter-layer resistivity is measured are important as they provide information on the Coulomb interactions in bilayer systems. When the layer densities are low correlation effects become significant to account for the quantitative description of experimental results. We investigate systematically various models of effective inter-layer interactions in a bilayer system and compare our results with recent experiments. In the low density regime, the correlation effects are included via the intra- and inter-layer local-field corrections. We employ several theoretical approaches to construct static local-field corrections. Our comparative study demonstrates the importance of including the correlation effects accurately in the calculation of drag resistivity. Recent experiments performed at low layer densities are adequately described by effective inter-layer interactions incorporating static correlations.
Asgari Reza
Davoudi Bahman
Tanatar B.
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