We develop a novel multi-configurational Symmetrized Projector Quantum Monte Carlo (MSPQMC) method to calculate excited state properties of Hubbard models. We compare the MSPQMC results for finite Hubbard chains with exact results (where available) or with Density Matrix Renormalization Group (DMRG) results for longer chains. The energies and correlation functions of the excited states are in g...

Kinetic and potential energies of systems of (4)He atoms in the solid phase are computed at T = 0. Results at two densities of the liquid phase are presented as well. Calculations are performed by the multiweight extension to the diffusion Monte Carlo method that allows the application of the Hellmann-Feynman theorem in a robust and efficient way. This is a general method that can be applied in...

The ground states of quantum spin 1/2 XY ferromagnetic triangular and square systems are investigated with the Green's function Monte Carlo (GFMC) method. Simulations are performed on L L two-dimensional lattices with L up to 19. The long range orders as well as ground state energies are obtained for both lattices and are extrapolated to innnite system size. The long range order (LRO) is comput...

The phaseless Auxiliary Field Quantum Monte Carlo (AFQMC) method provides a well established approximation scheme for accurate calculations of ground state energies of many-fermions systems. Here we address the possibility of calculating imaginary time correlation functions with the phaseless AFQMC. We give a detailed description of the technique and test the quality of the results for static p...

We have demonstrated electroswitchable emission and coloration using a novel composite material containing luminescent europium(III) complex Eu(hfa)(3)(H(2)O)(2) and diheptyl viologen HV(2+). The photoluminescence of the Eu(III) complex was controlled by the electrochemical coloration of HV(2+)via intermolecular energy transfer mechanisms.

The regional energy system (RES) is a that consumes multiple forms of in the region and achieves coordinated efficient utilization resources. RES composed micro systems (MESs); however, due to mismatch resources different consumption within each MES, large amount clean wasted, MES has acquire extra energy. This significantly increases operation costs contributes environmental pollution. One pro...