New Method Improves Accuracy of Band Gap Calculations in Semiconductors Using Coupled-Cluster Theory
Researchers developed a new computational approach called interacting-bath dynamical embedding theory (ibDET) that significantly reduces errors in calculating band gaps of semiconductors and insulators using equation-of-motion coupled-cluster theory. The method enables denser sampling of electronic states at lower computational cost, achieving a mean absolute error of 0.27 eV compared to experimental values. This advancement could improve the design and prediction of electronic properties in materials for semiconductor and photovoltaic applications.
A new study published on arXiv demonstrates that interacting-bath dynamical embedding theory (ibDET) resolves long-standing finite-size errors in periodic equation-of-motion coupled-cluster single and double excitations (EOM-CCSD) calculations for band gaps in solids. The traditional EOM-CCSD method has shown promise for accurate band structure calculations but suffers from steep computational scaling that limits calculations to coarse k-point meshes, introducing significant errors. By implementing ibDET as a Green's function embedding framework, researchers were able to increase k-point sampling to 10×10×10—far beyond what canonical periodic EOM-CCSD allows—while maintaining modest computational costs. Testing on ten semiconductors and insulators, the approach achieved a mean absolute error of 0.27 eV relative to experimental band gaps, outperforming the widely-used G₀W₀ method. The results suggest ibDET provides a practical pathway to high-accuracy many-body electronic structure calculations in periodic systems.
What's missing
The study does not discuss computational time comparisons or hardware requirements needed to implement ibDET relative to standard EOM-CCSD or G₀W₀ methods, which would be relevant for practical adoption. Additionally, the paper does not address the method's applicability to magnetic materials, strongly correlated systems, or other material classes beyond the ten semiconductors and insulators tested.
What different sources said
- arXiv physicsCenter
Resolving Finite-Size Errors in EOM-CCSD Band Gaps of Solids with Interacting-Bath Dynamical Embedding Theory
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