Approximate and exact nodes of fermionic wavefunctions: coordinate transformations and topologies

Details Approximate and exact nodes of fermionic wavefunctions: coordinate transformations and topologies Approximate and exact nodes of fermionic wavefunctions: coordinate transformations and topologies

2004-09-15

arxiv.org/abs/cond-mat/0409406v2

Physics

Condensed Matter

Other Condensed Matter

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.72.075131

A study of fermion nodes for spin-polarized states of a few-electron ions and molecules with $s,p,d$ one-particle orbitals is presented. We find exact nodes for some cases of two electron atomic and molecular states and also the first exact node for the three-electron atomic system in $^4S(p^3)$ state using appropriate coordinate maps and wavefunction symmetries. We analyze the cases of nodes for larger number of electrons in the Hartree-Fock approximation and for some cases we find transformations for projecting the high-dimensional node manifolds into 3D space. The node topologies and other properties are studied using these projections. We also propose a general coordinate transformation as an extension of Feynman-Cohen backflow coordinates to both simplify the nodal description and as a new variational freedom for quantum Monte Carlo trial wavefunctions.

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