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Updated: Oct 18, 2025

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Published on: October 12, 2019
vdW-DF-ahcx: a range-separated van der Waals density functional hybrid
Vivekanand Shukla1, Yang Jiao1, Carl M Frostenson1
1Microtechnology and Nanoscience-MC2, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
A new range-separated hybrid functional, vdW-DF-ahcx, is introduced for improved descriptions of materials. This method accurately characterizes bulk properties and noble-metal surface interactions, including CO adsorption.
Area of Science:
- Computational Chemistry
- Materials Science
- Condensed Matter Physics
Background:
- Hybrid density functionals incorporate Fock-exchange for improved accuracy.
- Range-separated hybrids (RSHs) are effective for metal and surface characterizations.
- Existing RSHs often use generalized gradient approximation (GGA) functionals like PBE or HSE.
Purpose of the Study:
- To develop a novel analytical-hole consistent-exchange RSH extension to the van der Waals density functional (vdW-DF) method.
- To introduce the vdW-DF-ahcx functional for enhanced material property predictions.
- To evaluate the performance of vdW-DF-ahcx for bulk and surface properties.
Main Methods:
- Characterization of GGA-type exchange within the vdW-DF-cx framework.
- Isolation of the short-ranged exchange component.
- Definition and implementation of the new vdW-DF hybrid functional, vdW-DF-ahcx.
Main Results:
- vdW-DF-ahcx demonstrates favorable performance compared to dispersion-corrected HSE for bulk properties.
- Accurate descriptions of noble-metal surface properties are achieved with vdW-DF-ahcx.
- The functional effectively models CO adsorption on metal surfaces.
Conclusions:
- vdW-DF-ahcx offers a promising new tool for accurate electronic structure calculations.
- The developed functional advances the capability of vdW-DF methods for surface science applications.
- This work paves the way for more reliable predictions of material behavior at the nanoscale.
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