Extending density matrix embedding: A static two-particle theory

We introduce extended density matrix embedding theory (EDMET), a static quantum explicitly self-consistent with respect to local two-body physics. This overcomes the biggest practical and conceptual limitation of more traditional one-body methods, namely lack screening treatment longer-range interactions. algebraic zero-temperature augments interacting cluster model minimal number bosons from description full system correlations via random phase approximation, admits an analytic approach build Coulomb-exchange-correlation kernel. For Hubbard models nonlocal interactions, this leads accurate transitions, quantities, dynamics. also move towards ab initio systems Parriser-Parr-Pople conjugated coronene derivatives, finding good agreement experimental optical gaps.