30 citations · 88 across the 9 of their papers we have counts for
7 papers · 1 filter
Simulation of inhomogeneous distributions of ultracold atoms in an optical lattice via a massively parallel implementation of nonequilibrium strong-coupling perturbation theory
A. Dirks, K. Mikelsons, H. R. Krishnamurthy +1
We present a nonequilibrium strong-coupling approach to inhomogeneous systems of ultracold atoms in optical lattices. We demonstrate its application to the Mott-insulating phase of…
Theoretical Description of Coherent Doublon Creation via Lattice Modulation Spectroscopy
A. Dirks, K. Mikelsons, H. R. Krishnamurthy +1
Using a recently developed strong-coupling method, we present a comprehensive theory for doublon production processes in modulation spectroscopy of a three-dimensional system of ul…
Double Occupancy and Magnetic Susceptibility of the Anderson Impurity Model out of Equilibrium
A. Dirks, S. Schmitt, J. E. Han +3
We use different numerical approaches to calculate the double occupancy and mag- netic susceptibility as a function of a bias voltage in an Anderson impurity model. Specifically, w…
Extracting spectral properties from Keldysh Green functions
Andreas Dirks, Martin Eckstein, Thomas Pruschke +1
We investigate the possibility to assist the numerically ill-posed calculation of spectral properties of interacting quantum systems in thermal equilibrium by extending the imagina…
Imaginary-time quantum many-body theory out of equilibrium II: Analytic continuation of dynamic observables and transport properties
Andreas Dirks, Jong E. Han, Mark Jarrell +1
Within the imaginary-time theory for nonequilibrium in quantum dot systems the calculation of dynamical quantities like Green's functions is possible via a suitable quantum Monte-C…
Imaginary-time quantum many-body theory out of equilibrium I: Formal equivalence to Keldysh real-time theory and calculation of static properties
Jong E. Han, Andreas Dirks, Thomas Pruschke
We discuss the formal relationship between the real-time Keldysh and imaginary-time theory for nonequilibrium in quantum dot systems. The latter can be reformulated using the recen…