Temperature and Pinning Effects on Driving a 2D Electron System on a Helium Film: A Numerical Study
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- Damasceno, P.F., DaSilva, C.J., Rino, J.P. et al. J Low Temp Phys (2010) 160: 58. doi:10.1007/s10909-010-0172-9
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Using numerical simulations we investigated the dynamic response to an externally driven force of a classical two-dimensional (2D) electron system on a helium film at finite temperatures. A potential barrier located at the center of the system behaves as a pinning center that results in an insulator state below a threshold driving force. We have found that the current-voltage characteristic obeys the scaling relation I=fξ, with ξ ranging from ∼(1.0–1.7) for different pinning strengths and temperatures. Our results may be used to understand the spread range of ξ in experiments with typical characteristic of plastic depinning.