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Title: Relationship between population dynamics and the self-energy in driven non-equilibrium systems

We compare the decay rates of excited populations directly calculated within a Keldysh formalism to the equation of motion of the population itself for a Hubbard-Holstein model in two dimensions. While it is true that these two approaches must give the same answer, it is common to make a number of simplifying assumptions, within the differential equation for the populations, that allows one to interpret the decay in terms of hot electrons interacting with a phonon bath. Furthermore, we show how care must be taken to ensure an accurate treatment of the equation of motion for the populations due to the fact that there are identities that require cancellations of terms that naively look like they contribute to the decay rates. In particular, the average time dependence of the Green's functions and self-energies plays a pivotal role in determining these decay rates.
 [1] ;  [2]
  1. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
  2. Georgetown Univ., Washington, DC (United States). Dept. of Physics
Publication Date:
OSTI Identifier:
Grant/Contract Number:
FG02-08ER46542; AC02-05CH11231
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 18; Journal Issue: 5; Journal ID: ISSN 1099-4300
Research Org:
Georgetown Univ., Washington, DC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS population dynamics; non-equilibrium Keldysh; scattering integrals; field theory