scholarly journals Two-step Brillouin zone sampling for efficient computation of electron dynamics in solids

2021 ◽  
Author(s):  
Shunsuke A. Sato
Keyword(s):  
Brillouin Zone ◽  
Density Functional ◽  
Integration Scheme ◽  
Electronic Systems ◽  
Efficient Computation ◽  
Decomposition Scheme ◽  
High Order Harmonic ◽  
Linear Optical Properties ◽  
Synchronization Overhead ◽  
Zone Sampling

Abstract We develop a numerical Brillouin-zone integration scheme for real-time propagation of electronic systems with time-dependent density functional theory. This scheme is based on the decomposition of a large simulation into a set of small independent simulations. The performance of the decomposition scheme is examined in both linear and nonlinear regimes by computing the linear optical properties of bulk silicon and high-order harmonic generation. The decomposition of a large simulation into a set of independent simulations can improve the efficiency of parallel computation by reducing communication and synchronization overhead and enhancing the portability of simulations across a relatively small cluster machine.

Experimental and Theoretical (ab initio and DFT) Analysis of UV-Vis Spectra, Thermodynamic Functions and Non-linear Optical Properties of 2-Chloro-3,4-Dimethoxybenzaldehyde

2015 ◽  
Vol 8 (2) ◽  
pp. 2122-2134
Author(s):  
Sarvendra Kumar ◽  
Rajesh Kumar ◽  
Jayant Teotia ◽  
M. K. Yadav
Keyword(s):  
Thermodynamic Functions ◽  
Title Compound ◽  
Density Functional ◽  
Structural Characteristics ◽  
Basis Sets ◽  
Ultraviolet Absorption Spectrum ◽  
Non Linear ◽  
Different Temperatures ◽  
Linear Optical Properties ◽  
Linear Optical

In the present work, UV- Visible spectra of 2-Chloro-3,4-Dimethoxybenzaldehyde (2,3,4-CDMB) compound  have been carried out experimentally and theoretically. The ultraviolet absorption spectrum of title compound in three solvents (Acetone, Diethyl Ether, CCl4) of different polarity were examined in the range of 200–500 nm. The structure of the molecule was optimized and the structural characteristics were determined by HF and DFT (B3LYP) methods with 6-31+G(d,p) and 6-311++G(d,p) as basis sets. The excitation energy, wavelength corresponds to absorption maxima () and oscillator strength (f) are calculated by Time-Dependent Density Functional Theory (TD-DFT) using B3LYP/6-31+G(d,p) and B3LYP/6-311++G(d,p) as basis sets. The electric dipole moment (μ), polarizability (α) and the first hyperpolarizability (β ) have been computed to evaluate the non-linear optical (NLO) response of the investigated compound by HF and DFT (B3LYP) with already mentioned basis sets. Thermodynamic functions of the title compound at different temperatures were also calculated.

Theoretical study of the non linear optical properties of alkali metal (Li, Na, K) doped aluminum nitride nanocages

RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 94228-94235 ◽  
Author(s):  
Maria Maria ◽  
Javed Iqbal ◽  
Khurshid Ayub
Keyword(s):  
Density Functional Theory ◽  
Optical Properties ◽  
Alkali Metal ◽  
Aluminum Nitride ◽  
Density Functional ◽  
Theoretical Study ◽  
Dft Methods ◽  
Functional Theory ◽  
Non Linear ◽  
Linear Optical Properties

The effect of alkali metal (Li, Na, and K) doping in aluminum nitride (Al12N12) nanocages is studied through density functional theory (DFT) methods.

Are phosphide nano-cages better than nitride nano-cages? A kinetic, thermodynamic and non-linear optical properties study of alkali metal encapsulated X12Y12 nano-cages

2016 ◽  
Vol 4 (46) ◽  
pp. 10919-10934 ◽  
Author(s):  
Khurshid Ayub
Keyword(s):  
Density Functional Theory ◽  
Alkali Metal ◽  
Density Functional ◽  
Stability Boundary ◽  
Density Functional Theory Calculations ◽  
Boundary Crossing ◽  
Functional Theory ◽  
Non Linear ◽  
Linear Optical Properties ◽  
Better Than

Density functional theory calculations have been performed for alkali metal encapsulated X12Y12 nano-cages (X = B, Al and Y = N, P) to evaluate their stability, boundary crossing barriers and optical (linear and non-linear) properties.

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