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Do dielectric nanostructures turn metallic in high-electric dc fields?
E P Silaeva1, L Arnoldi, M L Karahka
1Groupe de Physique des Matériaux UMR CNRS 6634, Normandie Université, Université-INSA de Rouen , Avenue de l'Université BP 12, 76801 Saint Etienne du Rouvray, France.
Nano Letters
|October 2, 2014
Summary
Electric fields penetrate only a few nanometers into dielectric nanostructures due to screening. This creates a metal-like surface with optical absorption, impacting nanodevice performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Understanding electric field behavior in dielectric nanostructures is crucial for advanced electronics.
- Dielectric materials are key components in many nanoscale devices.
Purpose of the Study:
- To investigate electric dc field penetration in three-dimensional dielectric nanostructures.
- To analyze the impact of strong electric fields on the electronic and optical properties of these nanostructures.
Main Methods:
- Field Ion Microscopy (FIM) for direct analysis of field penetration.
- Laser-assisted Atom Probe Tomography (APT) for experimental validation.
- First-principle calculations for theoretical prediction.
Main Results:
- Electric fields are screened within a few nanometers inside dielectric nanostructures.
- Strong surface fields induce band gap shrinkage, leading to metal-like optical absorption.
- Experimental and theoretical methods confirmed these findings.
Conclusions:
- The study reveals fundamental mechanisms governing field-dielectric interactions at the nanoscale.
- Findings offer insights into the performance of field-effect nanodevices like nanotransistors and supercapacitors.
- This work enhances understanding of field evaporation in dielectric nanotips for techniques like APT.
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