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Healthy Research Rewards
ResearchHub is incentivizing healthy research behavior. At this time, first authors of open access papers are eligible for rewards. Visit the publications tab to view your eligible publications.
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Gianluca Maria Farinola
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Locality properties and Wannier functions for interacting systems
Monica Ceretti
et al.
May 21, 2001
We define Wannier functions for interacting systems, and show that theresults on the localization of the Wannier functions for non-interactingsystems carry over to the Wannier functions for interacting systems. Inaddition we demonstrate that the characterization of metals and insulators bythe decay properties of their respective density matrices does not only applyto non-interacting, but also to interacting systems. As a prototypical exampleof a correlated system we investigate the one-dimensional Hubbard model. Wepropose an expression for the density matrix of that model, and derive arelation between the decay constant of the density matrix and the gap.
Materials Science
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Materials Science
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Meandering instability of curved step edges on growth of a crystalline cone
Chin-Chun Tsai
et al.
Jul 30, 2001
We study the meandering instability during growth of an isolatednanostructure, a crystalline cone, consisting of concentric circular steps. Theonset of the instability is studied analytically within the framework of thestandard Burton-Cabrera-Frank model, which is applied to describe step flowgrowth in circular geometry. We derive the correction to the most unstablewavelength and show that in general it depends on the curvature in acomplicated way. Only in the asymptotic limit where the curvature approacheszero the results are shown to reduce to the rectangular case. The resultsobtained here are of importance in estimating growth regimes for stablenanostructures against step meandering.
Materials Science
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Materials Science
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Nuclear matter hole spectral function in the Bethe-Brueckner-Goldstone approach
Raymond W. Lam
et al.
Dec 19, 2001
The hole spectral function is calculated in nuclear matter to assess therelevance of nucleon-nucleon short range correlations. The calculation iscarried out within the Brueckner scheme of many-body theory by using severalnucleon-nucleon realistic interactions. Results are compared with otherapproaches based on variational methods and transport theory. Discrepanciesappear in the high energy region, which is sensitive to short rangecorrelations, and are due to the different many-body treatment more than to thespecific N-N interaction used. Another conclusion is that the momentumdependence of the G-matrix should be taken into account in any self consistentapproach.
Nuclear Physics
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Nuclear Physics
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