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Title: Static electric field enhancement in nanoscale structures

Abstract

We study the effect of local atomic- and nano-scale protrusions on field emission and, in particular, on the local field enhancement which plays a key role as known from the Fowler-Nordheim model of electronic emission. We study atomic size defects which consist of right angle steps forming an infinite length staircase on a tungsten surface. This structure is embedded in a 1 GV/m ambient electrostatic field. We perform calculations based upon density functional theory in order to characterize the total and induced electronic densities as well as the local electrostatic fields taking into account the detailed atomic structure of the metal. We show how the results must be processed to become comparable with those of a simple homogeneous tungsten sheet electrostatic model. We also describe an innovative procedure to extrapolate our results to nanoscale defects of larger sizes, which relies on the microscopic findings to guide, tune, and improve the homogeneous metal model, thus gaining predictive power. Furthermore, we evidence analytical power laws for the field enhancement characterization. The main physics-wise outcome of this analysis is that limited field enhancement is to be expected from atomic- and nano-scale defects.

Authors:
;  [1];  [2];  [1];  [2];  [3]
  1. Université de Toulouse, UPS, Laboratoire Collisions Agrégats Réactivité, IRSAMC, F-31062 Toulouse (France)
  2. (France)
  3. (Cuba)
Publication Date:
OSTI Identifier:
22598842
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 120; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; DEFECTS; DENSITY FUNCTIONAL METHOD; ELECTRIC FIELDS; FIELD EMISSION; FOWLER-NORDHEIM THEORY; LENGTH; NANOSTRUCTURES; SURFACES; TUNGSTEN

Citation Formats

Lepetit, Bruno, E-mail: bruno.lepetit@irsamc.ups-tlse.fr, Lemoine, Didier, E-mail: didier.lemoine@irsamc.ups-tlse.fr, CNRS, UMR 5589, F-31062 Toulouse, Márquez-Mijares, Maykel, E-mail: mmarquez@instec.cu, CNRS, UMR 5589, F-31062 Toulouse, and Instituto Superior de Tecnologías y Ciencias Aplicadas, Avenida Salvador Allende 1110, Quinta de los Molinos, La Habana. Static electric field enhancement in nanoscale structures. United States: N. p., 2016. Web. doi:10.1063/1.4961216.
Lepetit, Bruno, E-mail: bruno.lepetit@irsamc.ups-tlse.fr, Lemoine, Didier, E-mail: didier.lemoine@irsamc.ups-tlse.fr, CNRS, UMR 5589, F-31062 Toulouse, Márquez-Mijares, Maykel, E-mail: mmarquez@instec.cu, CNRS, UMR 5589, F-31062 Toulouse, & Instituto Superior de Tecnologías y Ciencias Aplicadas, Avenida Salvador Allende 1110, Quinta de los Molinos, La Habana. Static electric field enhancement in nanoscale structures. United States. doi:10.1063/1.4961216.
Lepetit, Bruno, E-mail: bruno.lepetit@irsamc.ups-tlse.fr, Lemoine, Didier, E-mail: didier.lemoine@irsamc.ups-tlse.fr, CNRS, UMR 5589, F-31062 Toulouse, Márquez-Mijares, Maykel, E-mail: mmarquez@instec.cu, CNRS, UMR 5589, F-31062 Toulouse, and Instituto Superior de Tecnologías y Ciencias Aplicadas, Avenida Salvador Allende 1110, Quinta de los Molinos, La Habana. Sun . "Static electric field enhancement in nanoscale structures". United States. doi:10.1063/1.4961216.
@article{osti_22598842,
title = {Static electric field enhancement in nanoscale structures},
author = {Lepetit, Bruno, E-mail: bruno.lepetit@irsamc.ups-tlse.fr and Lemoine, Didier, E-mail: didier.lemoine@irsamc.ups-tlse.fr and CNRS, UMR 5589, F-31062 Toulouse and Márquez-Mijares, Maykel, E-mail: mmarquez@instec.cu and CNRS, UMR 5589, F-31062 Toulouse and Instituto Superior de Tecnologías y Ciencias Aplicadas, Avenida Salvador Allende 1110, Quinta de los Molinos, La Habana},
abstractNote = {We study the effect of local atomic- and nano-scale protrusions on field emission and, in particular, on the local field enhancement which plays a key role as known from the Fowler-Nordheim model of electronic emission. We study atomic size defects which consist of right angle steps forming an infinite length staircase on a tungsten surface. This structure is embedded in a 1 GV/m ambient electrostatic field. We perform calculations based upon density functional theory in order to characterize the total and induced electronic densities as well as the local electrostatic fields taking into account the detailed atomic structure of the metal. We show how the results must be processed to become comparable with those of a simple homogeneous tungsten sheet electrostatic model. We also describe an innovative procedure to extrapolate our results to nanoscale defects of larger sizes, which relies on the microscopic findings to guide, tune, and improve the homogeneous metal model, thus gaining predictive power. Furthermore, we evidence analytical power laws for the field enhancement characterization. The main physics-wise outcome of this analysis is that limited field enhancement is to be expected from atomic- and nano-scale defects.},
doi = {10.1063/1.4961216},
journal = {Journal of Applied Physics},
number = 8,
volume = 120,
place = {United States},
year = {Sun Aug 28 00:00:00 EDT 2016},
month = {Sun Aug 28 00:00:00 EDT 2016}
}