scholarly journals Optoelectronic Properties of Carbon Nanorings: Excitonic Effects from Time-Dependent Density Functional Theory

2009 ◽  
Vol 113 (52) ◽  
pp. 21921-21927 ◽  
Author(s):  
Bryan M. Wong
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Optoelectronic Properties ◽  
Time Dependent ◽  
Functional Theory ◽  
Excitonic Effects ◽  
Carbon Nanorings ◽  
Dependent Density

Excitonic effects in a time-dependent density functional theory

2007 ◽  
Vol 127 (11) ◽  
pp. 114902 ◽  
Author(s):  
Kirill I. Igumenshchev ◽  
Sergei Tretiak ◽  
Vladimir Y. Chernyak
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Time Dependent ◽  
Functional Theory ◽  
Excitonic Effects ◽  
Dependent Density

scholarly journals Dimension-dependent band alignment and excitonic effects in graphitic carbon nitride: a many-body perturbation and time-dependent density functional theory study

RSC Advances ◽  
2017 ◽  
Vol 7 (71) ◽  
pp. 44997-45002 ◽  
Author(s):  
W. F. Espinosa-García ◽  
J. M. Osorio-Guillén ◽  
C. Moyses Araujo
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Band Alignment ◽  
Time Dependent ◽  
Many Body ◽  
Functional Theory ◽  
Many Body Theory ◽  
Excitonic Effects ◽  
Body Theory ◽  
Dependent Density

First-principles many-body theory and time-dependent density functional theory were used to study the dimension effects on the band alignment and optical properties of s-triazine and graphitic C3N4.

Benchmark of Simplified Time-Dependent Density Functional Theory for UV-Vis Spectral Properties of Porphyrinoids

2019 ◽  
Author(s):  
Kamal Batra ◽  
Stefan Zahn ◽  
Thomas Heine
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Large Scale ◽  
Absolute Error ◽  
Time Dependent ◽  
Basis Set ◽  
Basis Sets ◽  
Functional Theory ◽  
Framework Materials ◽  
Dependent Density

<p>We thoroughly benchmark time-dependent density- functional theory for the predictive calculation of UV/Vis spectra of porphyrin derivatives. With the aim to provide an approach that is computationally feasible for large-scale applications such as biological systems or molecular framework materials, albeit performing with high accuracy for the Q-bands, we compare the results given by various computational protocols, including basis sets, density-functionals (including gradient corrected local functionals, hybrids, double hybrids and range-separated functionals), and various variants of time-dependent density-functional theory, including the simplified Tamm-Dancoff approximation. An excellent choice for these calculations is the range-separated functional CAM-B3LYP in combination with the simplified Tamm-Dancoff approximation and a basis set of double-ζ quality def2-SVP (mean absolute error [MAE] of ~0.05 eV). This is not surpassed by more expensive approaches, not even by double hybrid functionals, and solely systematic excitation energy scaling slightly improves the results (MAE ~0.04 eV). </p>

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