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Recently, Varga developed a similar method for quasi-one-dimensional systems in which the density matrix is computed based on a contour integration and the evaluation of the Green's function by making use of a L D L T factorization (Ref.). Although he suggested a possible way to extend his method to higher dimensional systems, the feasibility and the required computational cost remain unclear.
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When z0 =i Re2 and z1 =i Re, it can be shown that in Eq. Re [λG (i Re2 ) ] ∼O (κ) and Re [γG (i Re ) ] ∼O ( ∑ν εν ), implying that they are not a large number, which is effective to avoid the numerical round-off error in the calculation of Eq. .
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When z 0 = i R e 2 and z 1 = i R e, it can be shown that in Eq. Re [λ G (i R e 2)] ∼ O (κ) and Re [γ G (i R e)] ∼ O (∑ ν ε ν), implying that they are not a large number, which is effective to avoid the numerical round-off error in the calculation of Eq..
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In a precise sense, we use domain to mean a system that we are now trying to bisect into two subdomains. In the recursive dissection, we obtain two subdomains after the dissection of the domain. Once we move to each subdomain to perform the next dissection, then the subdomain is called domain in the precise sense. In the text both the terms are distinguished for cases which may cause confusion.
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In a precise sense, we use domain to mean a system that we are now trying to bisect into two subdomains. In the recursive dissection, we obtain two subdomains after the dissection of the domain. Once we move to each subdomain to perform the next dissection, then the subdomain is called domain in the precise sense. In the text both the terms are distinguished for cases which may cause confusion.
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) 2 with the analytically evaluated coefficients as initial values. We find that the coefficients refined by the minimization are much more accurate than the analytic ones for serious cases, and that the refinement is quite effective to avoid the numerical instability.
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) 2 with the analytically evaluated coefficients as initial values. We find that the coefficients refined by the minimization are much more accurate than the analytic ones for serious cases, and that the refinement is quite effective to avoid the numerical instability.
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It is noted that the recurrence formula derived by Lin allows us to compute selected elements in O ( N2 ) operations for 3D systems (Ref.), which is superior to our recurrence formulas. However, the size of separators in their way for the nested dissection can be larger than that of our separators especially for the case that basis functions overlap with a number of other basis functions like in the PAO basis functions, which leads to a large prefactor for the computational cost in spite of the lower scaling. Also, the comparison with the algorithm by Takahashi (Ref.) and Erisman and Tinney (Ref.) will be in a future work.
-
It is noted that the recurrence formula derived by Lin allows us to compute selected elements in O (N 2) operations for 3D systems (Ref.), which is superior to our recurrence formulas. However, the size of separators in their way for the nested dissection can be larger than that of our separators especially for the case that basis functions overlap with a number of other basis functions like in the PAO basis functions, which leads to a large prefactor for the computational cost in spite of the lower scaling. Also, the comparison with the algorithm by Takahashi (Ref.) and Erisman and Tinney (Ref.) will be in a future work.
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The code, OPENMX, pseudoatomic basis functions, and pseudopotentials are available on a web site
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The code, OPENMX, pseudoatomic basis functions, and pseudopotentials are available on a web site, http://www.openmx-square.org/
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