We performed a Langevin molecular dynamics simulation to study the response of a two-dimensional ͑2D͒ constrained electron system on a helium film due to an external force parallel to the surface. The electron drift velocity was obtained as a function of the driven force for different values of film thickness and dielectric constants of the substrate in the low temperature regime ͑T → 0͒. We observed that the system had undergone an insulator-conductor transition after a finite depinning threshold of the driven force. This should be helpful for understanding the nonlinear dc conductivity observed in 2D systems, such as that in semiconductor heterostructures.
Monografia apresentada ao Departamento de Administração como requisito parcial à obtenção do título de Bacharel em Administração, na modalidade a distância, pela Universidade de Brasília (UnB).
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