Improved lattice operators for non-relativistic fermions

Understand

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.