Imaginary time, shredded propagator method for large-scale GW calculations

Abstract

The GW method is a many-body approach capable of providing quasiparticle bands for realistic systems spanning physics, chemistry, and materials science. Despite its power, GW is not routinely applied to large complex materials due to its computational expense. We perform an exact recasting of the GW polarizability and the self-energy as Laplace integrals over imaginary time propagators. We then "shred" the propagators (via energy windowing) and approximate them in a controlled manner by using Gauss-Laguerre quadrature and discrete variable methods to treat the imaginary time propagators in real space. The resulting cubic scaling GW method has a sufficiently small prefactor to outperform standard quartic scaling methods on small systems (>=10 atoms) and also represents a substantial improvement over several other cubic methods tested. This approach is useful for evaluating quantum mechanical response function involving large sums containing energy (difference) denominators.

5 pages, 5 figures, supplementary material

References in corpus (5)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Cubic scaling $GW$: towards fast quasiparticle calculations
• Breaking the theoretical scaling limit for predicting quasi-particle energies: The stochastic GW approach
• Towards Fully Converged GW Calculations for Large Systems
• Scalable GW software for quasiparticle properties using OpenAtom

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