scholarly journals Determination of a Density Functional Tight Binding Model with an Extended Basis Set and Three-Body Repulsion for Carbon Under Extreme Pressures and Temperatures

2013 ◽  
Vol 117 (15) ◽  
pp. 7885-7894 ◽  
Author(s):  
Nir Goldman ◽  
Sriram Goverapet Srinivasan ◽  
Sebastien Hamel ◽  
Laurence E. Fried ◽  
Michael Gaus ◽  
...  
Keyword(s):  
Density Functional ◽  
Tight Binding ◽  
Basis Set ◽  
Tight Binding Model ◽  
Binding Model ◽  
Three Body ◽  
Extended Basis

scholarly journals A Density Functional Tight Binding Model with an Extended Basis Set and Three-Body Repulsion for Hydrogen under Extreme Thermodynamic Conditions

2014 ◽  
Vol 118 (29) ◽  
pp. 5520-5528 ◽  
Author(s):  
Sriram Goverapet Srinivasan ◽  
Nir Goldman ◽  
Isaac Tamblyn ◽  
Sebastien Hamel ◽  
Michael Gaus
Keyword(s):  
Density Functional ◽  
Tight Binding ◽  
Basis Set ◽  
Tight Binding Model ◽  
Binding Model ◽  
Thermodynamic Conditions ◽  
Three Body ◽  
Extended Basis

Investigating 3,4-bis(3-nitrofurazan-4-yl)furoxan detonation with a rapidly tuned density functional tight binding model

2021 ◽  
Vol 154 (16) ◽  
pp. 164115
Author(s):  
Rebecca K. Lindsey ◽  
Sorin Bastea ◽  
Nir Goldman ◽  
Laurence E. Fried
Keyword(s):  
Density Functional ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Binding Model

Composition and Strain Dependence of the Piezoelectric Coefficients in Semiconductor Alloys

2007 ◽  
Vol 1017 ◽  
Author(s):  
T. Hammerschmidt ◽  
M. A. Migliorato ◽  
D. Powell ◽  
A. G. Cullis ◽  
G. P. Srivastava
Keyword(s):  
First Principles ◽  
Density Functional ◽  
Piezoelectric Coefficient ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Semiconductor Alloys ◽  
Binding Model ◽  
Functional Theory ◽  
Photo Current ◽  
Good Agreement

AbstractWe propose a tight-binding model for the polarization that considers direct and dipole contributions and employs microscopic quantities that can be calculated by first-principles methods, e.g. by employing Density Functional Theory (DFT). Applying our model to InxGa1-xAs alloys allows us to settle discrepancies between the values of e14 as obtained from experiments and from linear interpolations between the values of InAs and GaAs. Our calculated piezoelectric coefficient is in very good agreement with photo current measurements of InAs/GaAs(111) quantum well samples.

A Tight-Binding Model for Optical Properties of Porous Silicon

1997 ◽  
Vol 491 ◽  
Author(s):  
M. Cruz ◽  
M. R. Beltran ◽  
C. Wang ◽  
J. Tagüeña-Martinez
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Crystalline Silicon ◽  
Tight Binding ◽  
Basis Set ◽  
Extended Defects ◽  
Tight Binding Model ◽  
Binding Model ◽  
Semi Empirical ◽  
Good Agreement

ABSTRACTSemi-empirical tight-binding techniques have been extensively used during the last six decades to study local and extended defects as well as aperiodic systems. In this work we propose a tight-binding model capable of describing optical properties of disordered porous materials in a novel way. Besides discussing the details of this approach, we apply it to study porous silicon (p-Si). For this purpose, we use an sp3s* basis set and supercells, where empty columns are digged in the [001] direction in crystalline silicon (c-Si). The disorder of the pores is considered through a random perturbative potential, which relaxes the wave vector selection rule, resulting in a significant enlargement of the optically active k-zone. The dielectric function and the light absorption spectra are calculated. The results are compared with experimental data showing a good agreement.

Determination of the Fermi surface inCdSnAs2using a tight-binding model for chalcopyrites

1985 ◽  
Vol 32 (4) ◽  
pp. 2334-2336 ◽  
Author(s):  
F. A. P. Blom ◽  
H. Nachtegaele ◽  
J. T. Devreese
Keyword(s):  
Fermi Surface ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Binding Model

scholarly journals Tunable laser and photocurrents from linear atomic C chains

2015 ◽  
Vol 29 (20) ◽  
pp. 1550108
Author(s):  
Zheng-Zhe Lin
Keyword(s):  
Density Functional ◽  
Density Functional Theory Calculation ◽  
Tight Binding ◽  
Tunable Laser ◽  
Laser Pulses ◽  
Laser Medium ◽  
Tight Binding Model ◽  
Binding Model ◽  
Short Laser Pulses ◽  
Theory Calculation

By a tight-binding model, the interaction between linear atomic C chains (LACCs) and short laser pulses was investigated. LACCs were proposed to be used as a medium of laser whose wavelength can be continuously tuned in a range of 321–785[Formula: see text]nm. This data should be more accurate than the previous result [Europhys. Lett. 97 (2012) 27006] because pure density functional theory calculation always underestimates the band gap. According to the tight-binding model, the lifetime of conduction band (CB) bottom is about 1.9–2.3[Formula: see text]ns. The electrons pumped into the CB will quickly fall to the band bottom in a time of ps due to electron–phonon interactions. The above results indicate that LACCs are suitable for laser medium. By [Formula: see text] dichromatic laser pulses, photocurrents can be generated in LACCs, which can be applied as light-controlled signals.

scholarly journals Theoretical Studies of the Stone-Wales Defect in C36 Fullerene Embedded inside Zigzag Carbon Nanotube

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Konstantin S. Grishakov ◽  
Konstantin P. Katin ◽  
Mikhail M. Maslov
Keyword(s):  
Density Functional Theory ◽  
Carbon Nanotube ◽  
Density Functional ◽  
Activation Barrier ◽  
Tight Binding ◽  
Theoretical Studies ◽  
Tight Binding Model ◽  
Binding Model ◽  
Functional Theory ◽  
Wales Defect

We apply density functional theory at PBE/6-311G(d) level as well as nonorthogonal tight-binding model to study the Stone-Wales transformation in C36 fullerene embedded inside the (14,0) zigzag carbon nanotube. We optimize geometries of two different isomers with the D2d and the D6h symmetries and the transition state dividing them. The mechanism of Stone-Wales transformation from D2d to D6h symmetry for the encapsulated C36 is calculated to be the same as for the isolated one. It is found that the outer carbon wall significantly stabilizes the D6h isomer. However, carbon nanotube reduces the activation barrier of Stone-Wales rearrangement by 0.4 eV compared with the corresponding value for the isolated C36.

scholarly journals Development of a Multicenter Density Functional Tight Binding Model for Plutonium Surface Hydriding

2018 ◽  
Vol 14 (5) ◽  
pp. 2652-2660 ◽  
Author(s):  
Nir Goldman ◽  
Bálint Aradi ◽  
Rebecca K. Lindsey ◽  
Laurence E. Fried
Keyword(s):  
Density Functional ◽  
Tight Binding ◽  
Tight Binding Model ◽  
Binding Model
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