Analytic continuation average spectrum method for quantum liquids.
We revisit the problem of determining the real-frequency density response in quantum fluids via analytical continuation of imaginary-time quantum Monte Carlo data. We demonstrate that the average spectrum method (ASM) is capable of revealing resolved modes in the dynamic structure factor of both ortho-deuterium and liquid para-hydrogen, in agreement with experiments and quantum mode-coupling theories, while the maximum entropy approach yields only a smooth unimodal spectrum. Outstanding issues are discussed. Our work provides the first application of the ASM method in realistic off-lattice systems.
Reichman
David R
DR
Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA. reichman@chem.columbia.edu
Rabani
Eran
E