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Nonequilibrium dynamical mean-field theory (DMFT) solves correlated latticemodels by obtaining their local correlation functions from an effective modelconsisting of a single impurity in a self-consistently determined bath. Therecently developed mapping of this impurity problem from the Keldysh timecontour onto a time-dependent single-impurity Anderson model (SIAM) [C. Gramschet al., Phys. Rev. B 88, 235106 (2013)] allows one to use wave function-basedmethods in the context of nonequilibrium DMFT. Within this mapping, long timesin the DMFT simulation become accessible by an increasing number of bathorbitals, which requires efficient representations of the time-dependent SIAMwave function. These can be achieved by the multiconfiguration time-dependentHartree (MCTDH) method and its multi-layer extensions. We find that MCTDHoutperforms exact diagonalization for large baths in which the latter approachis still within reach and allows for the calculation of SIAMs beyond the systemsize accessible by exact diagonalization. Moreover, we illustrate thecomputation of the self-consistent two-time impurity Green's function withinthe MCTDH second quantization representation.

Multiconfiguration time-dependent Hartree impurity solver for nonequilibrium dynamical mean-field theory