Tight-binding basis states
Topological Insulators: Tight Binding Models and Surface States
... the Tight-Binding Method In this section we review the theory that will form the basis of our discussion of topological ...the tight-binding ...in tight-binding ...
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Quantum tight binding chains with dissipative coupling
... where Γ l is the decay rate into lth reservoir, δ ( t − τ ) is the Dirac delta-function and the averaging denoted by 〈…〉 is carried over the states of reservoirs. Now let us suggest that only the every second ...
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Tight-binding model in the theory of disordered crystals
... Electronic states of a system were described by multi-band tight-binding ...the basis of the wave functions of electron in the atom nucleus ...
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Structures and Local Electronic States of Dislocation Loop in 4H SiC via a Linear Scaling Tight Binding Study
... Parameterization of matrix elements in the semi-empirical TB Hamiltonian is an essential ingredient for TBMD simulations. Among a number of parameterizations of the TB Hamiltonian for SiC systems, we have chosen Mercer’s ...
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Tight-binding approximations to time-dependent density functional theory: A fast approach for the calculation of electronically excited states
... Benchmark results for both Mulliken and Löwdin transition charges can be found in Section IV A. In TD-DFTB, the atomic transition charges q ia, A are used in both the approximation of the (N occ × N virt ) 2 coupling ...
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Efficient tight-binding approach for the study of strongly correlated systems
... 4f states is large in comparison with the band ...as basis for spin filter devices 共because of its half metallicity兲, while Er-doped GaN samples have been successfully exploited 共because of the sharp ...
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Self-Consistent Environment-Dependent Tight-Binding. Methodology and Applications.
... minimal basis set can adequately reproduce low-lying smooth wave functions, and consequently low-lying eigenvalues, but it is insufficient to describe higher energy unoccupied states corresponding to more ...
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Generalized tight-binding transport model for graphene nanoribbon-based systems
... culated using the minimal model 共parameter set D, Table I兲. Comparison with the TRANSIESTA ab initio results 共Fig. 4兲 shows that the TB transport model faithfully reproduces the essential conductance features of both of ...
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Charge self consistent empirical tight binding cluster method for semiconductor surface structures
... occupied states o f one-electron energies and a residual ...Harrison’s Tight- Binding Model using the same parameter values as in the ...the basis set used in the quantum chemistry ...
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Spin orbit effects in the bismuth atom and dimer: tight-binding and density functional theory
... 6p states of the bismuth atom as a function of the spin–orbit strength computed using the FP-LAPW method and using TM and HGH ...plane-wave basis set and periodic boundary conditions are used in all ...
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Gaussian polarizable-ion tight binding
... chosen basis set by using Gaussian expansions, resulting in an internally consistent theory without the need for a fitting ...Gaussian Tight Binding (GTB) model gives molecular polarizabilities in ...
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Energy Dispersion Model using Tight Binding Theory
... Summary & Future Work 5.1 Summary In this research, we explained and implemented an ab-initio tight binding theory based process in an attempt to understand bandgap engineering in 2-D semiconduc- tors. ...
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The Amorphous-Crystal Interface in Silicon: a Tight-Binding Simulation
... orthogonal tight-binding ~ TB ! Hamiltonian that was param- etrized to represent accurately a wide range of bulk and sur- face structures of ...the tight-binding studies can also be used as ...
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New algebraic relationships between tight binding models
... quantum tight binding ...in tight binding models are named edges in graph theory, sites are called vertices, amplitudes become weights, and the tight-binding hamiltonian is ...
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Conductance of Graphene Nanoribbon Junctions and the Tight Binding Model
... nearest-neighbour tight binding ...nearest-neighbour tight binding analysis in conjunction with an efficient nonequilibrium Green ’ s function ...
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Empirical tight-binding model for titanium phase transformations
... We fit our model to total energies and electron eigenval- ues for several crystal structures over a range of volumes to produce a transferable model for the study of the ␣ → transformation in Ti. 3 The potential has ...
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Thermodynamic limit of crystal defects with finite temperature tight binding
... temperature, whereas our results treat the case of finite Fermi temperature; see the Conclusion for further discussion. A key ingredient in our analysis is a notion of locality of the electronic structure model, which ...
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Topological tight binding models from nontrivial square roots
... parent tight-binding Hamilto- nian written as H 0 = H 2 + αH + α 0 , which we exploited implicitly for the photonic realization with a reference propagation constant β 0 ...defect states in selected ...
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Topological tight binding models from nontrivial square roots
... VII. CONCLUDING REMARKS AND OUTLOOK In this work, we set out to explore whether interesting topological features can arise when one considers the concept of a square root of a Hamiltonian, as utilized by Dirac in the ...
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Next Nearest Neighbor Tight Binding Model of Plasmons in Graphene
... nearest-neighbor tight-binding model was previously considered to calculate the plasmon spectrum in graphene ...next-nearest-neighbor tight-binding ...
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