Article

Journal of Low Temperature Physics

, Volume 160, Issue 1, pp 58-67

First online:

Temperature and Pinning Effects on Driving a 2D Electron System on a Helium Film: A Numerical Study

  • Pablo F. DamascenoAffiliated withDepartamento de Física, Universidade Federal de São Carlos Email author 
  • , Cláudio José DaSilvaAffiliated withDepartamento de Física, Universidade Federal de São Carlos
  • , José Pedro RinoAffiliated withDepartamento de Física, Universidade Federal de São Carlos
  • , Ladir CândidoAffiliated withInstituto de Física, Universidade Federal de GoiásInstituto de Física de São Carlos, Universidade de São Paulo

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Abstract

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=f ξ , 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.

Keywords

Collective transport Electrons in helium Non-linear phenomena