Publications (15)
Phases of attractive spin-imbalanced fermions in square lattices
Simone Chiesa, Shiwei Zhang
We determine the relative stability of different ground-state phases of spin-imbalanced popula- tions of attractive fermions in square lattices. The phases are systematically chara…
FFLO order in ultra-cold atoms in three-dimensional optical lattices
Peter Rosenberg, Simone Chiesa, Shiwei Zhang
We investigate different ground-state phases of attractive spin-imbalanced populations of fermions in 3-dimensional optical lattices. Detailed numerical calculations are performed…
Accurate, efficient and simple forces with Quantum Monte Carlo methods
Simone Chiesa, David Ceperley, Shiwei Zhang
Computation of ionic forces using quantum Monte Carlo methods has long been a challenge. We introduce a simple procedure, based on known properties of physical electronic densities…
QMCPACK : An open source ab initio Quantum Monte Carlo package for the electronic structure of atoms, molecules, and solids
Jeongnim Kim, Andrew Baczewski, Todd D. Beaudet +45
QMCPACK is an open source quantum Monte Carlo package for ab-initio electronic structure calculations. It supports calculations of metallic and insulating solids, molecules, atoms,…
Magnetism and pairing of two-dimensional trapped fermions
Simone Chiesa, Christopher N. Varney, Marcos Rigol +1
The emergence of local phases in a trapped two-component Fermi gas in an optical lattice is studied using quantum Monte Carlo simulations. We treat temperatures that are comparable…
Annihilation rate in positronic systems by quantum Monte Carlo. eLiH as test case
Massimo Mella, Simone Chiesa, Gabriele Morosi
An accurate method to compute the annihilation rate in positronic systems by means of quantum Monte Carlo simulations is tested and compared with previously proposed methods using…
Magnetic transition in a correlated band insulator
Axel Euverte, Simone Chiesa, Richard . T. Scalettar +1
The effect of on-site electron-electron repulsion in a band insulator is explored for a bilayer Hubbard Hamiltonian with opposite sign hopping in the two sheets. The ground sta…
o-Positronium scattering off H and He
Simone Chiesa, Massimo Mella, Gabriele Morosi
Exploiting an approach similar to the R-matrix theory, the diffusion Monte Carlo method is employed to compute phase shifts and threshold cross sections for the elastic scattering…
The response to dynamical modulation of the optical lattice for fermions in the Hubbard model
Zhaoxin Xu, Simone Chiesa, Shuxiang Yang +5
Fermionic atoms in a periodic optical lattice provide a realization of the single-band Hubbard model. Using Quantum Monte Carlo simulations along with the Maximum Entropy Method, w…
Finite f-Electron Bandwidth in a Heavy Fermion Model
Axel Euverte, Simone Chiesa, Richard T. Scalettar +1
Determinant Quantum Monte Carlo (DQMC) is used to study the effect of non-zero hopping t_f in the localized f-band of the periodic Anderson model (PAM) in two dimensions. The low t…
The Finite Size Error in Many-body Simulations with long-Ranged Interactions
Simone Chiesa, David M. Ceperley, Richard M. Martin +1
We discuss the origin of the finite size error of the energy in many-body simulation of systems of charged particles and we propose a correction based on the random phase approxima…
Rashba spin-orbit coupling, strong interactions, and the BCS-BEC crossover in the ground state of the two-dimensional Fermi Gas
Hao Shi, Peter Rosenberg, Simone Chiesa +1
The recent experimental realization of spin-orbit coupled Fermi gases provides a unique opportunity to study the interplay between strong interaction and SOC in a tunable, disorder…
Exact Numerical Results on the Ground State of Strongly Interacting Fermi Gases in Two Dimensions
Hao Shi, Simone Chiesa, Shiwei Zhang
Exact calculations are performed on the two-dimensional strongly interacting, unpolarized, uniform Fermi gas with a zero-range attractive interaction. Two auxiliary-field approache…
Magnetic order in the repulsive Fermi-Hubbard model in three-dimensions and the crossover to two-dimensions
Jie Xu, Simone Chiesa, Eric J. Walter +1
Systems of fermions described by the three-dimensional (3D) repulsive Hubbard model on a cubic lattice have recently attracted considerable attention due to their possible experime…
Disorder-Induced Stabilization of the Pseudogap in Strongly Correlated Systems
Simone Chiesa, Prabuddha B. Chakraborty, Warren E. Pickett +1
The interplay of strong interaction and strong disorder, as contained in the Anderson-Hubbard model, is addressed using two non-perturbative numerical methods: the Lanczos algorith…