Efficient impurity-bath trial states from superposed Slater determinants

Weak-force detection with superposed coherent states

W. J. Munro,* K. Nemoto, G. J. Milburn, and S. L. Braunstein Hewlett Packard Laboratories, Bristol BS34 8HZ, United Kingdom School of Informatics, University of Wales, Dean Street, Bangor LL57 1UT, United Kingdom Institute for Quantum Information, California Institute of Technology, MC 107-81, Pasadena, California 91125-8100 Centre for Quantum Computer Technology, University of Queensland, Quee...

Impurity Induced States

Impurity states in Mott insulators

2014 The effect of a point scattering potential on the properties of a nearly half filled narrow energy-band is studied in the limit of strong intra-atomic Coulomb repulsions. The potential needed to localize a state depends on the spin configuration. A localized hole is found to stabilize a ferromagnetic polarization within a few atomic distances from the impurity. The strength of this couplin...

Angular-momentum Projection of Cranked Symmetry-unrestricted Slater Determinants

We report on development of a new feature of the code HFODD, allowing for the angular-momentum projection of cranked symmetry-unrestricted Slater determinants. After a brief overview of the main theoretical building blocks and formalism, we present several preliminary applications. In particular, we discuss the case of a well-deformed rotational band in Gd, and we show the emergence of uncompen...

Incorporating Geminals into an Unconstrained Sum of Slater Determinants

The wavefunction ψ for a system of N electrons under the time-independent, non-relativistic, multiparticle Schrödinger equation with the Born-Oppenheimer approximation is an antisymmetric function of N variables, each of the form γ = (r, σ) = ((x, y, z), σ) where σ ∈ {−1/2, 1/2} is the spin variable. A natural way to approximate ψ is as the antisymmetrization of a sum of products of functions o...