Enhancement of impact ionization in Hubbard clusters by disorder and next-nearest-neighbor hopping
arXiv:2007.16035 · doi:10.1103/PhysRevB.102.245125
Abstract
We perform time-resolved exact diagonalization of the Hubbard model with time dependent hoppings on small clusters of up to sites. Here, the time dependence originates from a classic electromagnetic pulse, which mimics the impact of a photon. We investigate the behavior of the double occupation and spectral function after the pulse for different cluster geometries and on-site potentials. We find impact ionization in all studied geometries except for one-dimensional chains. Adding next-nearest neighbor hopping to the model leads to a significant enhancement of impact ionization, as does disorder and geometric frustration of a triangular lattice.
arXiv comment16 pages, 25 figures
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- Photodriven Mott insulating heterostructures: A steady-state study of impact ionization processes