Graph-based linear scaling electronic structure theory
  We show how graph theory can be combined with quantum theory to calculate the electronic structure of large complex systems. The graph formalism is general and applicable to a broad range of electronic structure methods and materials, including challenging systems such as biomolecules. The methodology combines well-controlled accuracy, low computational cost, and natural low-communication parallelism. This combination addresses substantial shortcomings of linear scaling electronic structure theory, in particular with respect to quantum-based molecular dynamics simulations. 
Anders M.N. Niklasson and Susan M. Mniszewski and Christian F.A. Negre   and Marc J. Cawkwell and Pieter J. Swart and Jamal ...
physics.comp-ph cond-mat.mtrl-sci physics.chem-ph