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O(N) algorithms for disordered systems | Vincent E. Sacksteder
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1 Dec 2003 | Subject: | Disordered Systems and Neural Networks | cond-mat.dis-nn | Abstract: | The past thirteen years have seen the development of many algorithms for approximating matrix functions in O(N) time, where N is the basis size. These O(N) algorithms rely on assumptions about the spatial locality of the matrix function; therefore their validity depends very much on the argument of the matrix function. In this article I carefully examine the validity of certain O(N) algorithms when applied to hamiltonians of disordered systems. I focus on the prototypical disordered system, the Anderson model. I find that O(N) algorithms for the density matrix function can be used well below the Anderson transition (i.e. in the metallic phase;) they fail only when the coherence length becomes large. This paper also includes some experimental results about the Anderson model’s behavior across a range of disorders. | Source: | arXiv, cond-mat/0312046 | Services: | Forum | Review | PDF | Favorites |
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