Charge Excitations in Two-Leg Ladders: A tDMRG Approach
We study the dynamics of holon–doublon pairs in two-leg Hubbard ladders with the time-dependent Density Matrix Renormalization-Group approach. Benchmark results show that the Krylov algorithm is well suited to calculate the time dependence of observables in these systems. Furthermore, we show that the dynamics of the holon–doublon depend strongly on the coupling asymmetry within the ladder, indicating that the ladder geometry plays a role in the decay of these elementary charge excitations.
KeywordsDMRG Hubbard model Two-leg ladders Excitations
This work was supported by the Center for Nanophase Materials Sciences, sponsored by the Scientific User Facilities Division, Basic Energy Sciences, US Department of Energy, under contract with UT-Battelle. This research used resources of the National Center for Computational Sciences, as well as the OIC at Oak Ridge National Laboratory. L.G.G.V.D.S. acknowledges support from Brazilian agencies CNPq and FAPESP. E.D. was supported by the US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.