Charge Excitations in Two-Leg Ladders: A tDMRG Approach

  • Luis G. G. V. Dias da Silva
  • G. Alvarez
  • M. S. Summers
  • E. Dagotto
Original Paper

Abstract

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.

Keywords

DMRG Hubbard model Two-leg ladders Excitations 

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Luis G. G. V. Dias da Silva
    • 1
  • G. Alvarez
    • 2
  • M. S. Summers
    • 2
  • E. Dagotto
    • 3
    • 4
  1. 1.Instituto de FísicaUniversidade de São PauloSão PauloBrazil
  2. 2.Computer Science & Mathematics Division and Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeUSA
  3. 3.Department of Physics and AstronomyUniversity of TennesseeKnoxvilleUSA
  4. 4.Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeUSA

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