Improved lattice operators for non-relativistic fermions
arXiv:1203.2565 · doi:10.1103/PhysRevA.86.013604
Abstract
In this work I apply a recently proposed improvement procedure, originally conceived to reduce finite lattice spacing effects in transfer matrices for dilute Fermi systems, to tuning operators for the calculation of observables. I construct, in particular, highly improved representations for the energy and the contact, as a first step in an improvement program for finite-temperature calculations. I illustrate the effects of improvement on those quantities with a ground-state lattice calculation at unitarity.
11 pages, 7 figures; replaced with published version
References in corpus (9)
- Generalized Virial Theorem and Pressure Relation for a strongly correlated Fermi gas
- Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
- Three-boson problem at low energy and Implications for dilute Bose-Einstein condensates
- BEC-BCS crossover and universal relations in unitary Fermi gases
- Momentum Distribution and Contact of the Unitary Fermi gas
- Thermodynamics of a Trapped Unitary Fermi Gas
- The ground state energy at unitarity
- Three body on-site interactions in ultracold bosonic atoms in optical lattices and superlattices
- Precision benchmark calculations for four particles at unitarity