Double Time Window Targeting Technique: Real time DMRG dynamics in the PPP model

Details Double Time Window Targeting Technique: Real time DMRG dynamics in the PPP model Double Time Window Targeting Technique: Real time DMRG dynamics in the PPP model

2010-03-06

arxiv.org/abs/1003.1372v3

Phys. Rev B 82, 035115 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Final (published) version; 39 pages, 13 figures, 1 table; 2 new references added

Scientific paper

10.1103/PhysRevB.82.035115

We present a generalized adaptive time-dependent density matrix renormalization group (DMRG) scheme, called the {\it double time window targeting} (DTWT) technique, which gives accurate results with nominal computational resources, within reasonable computational time. This procedure originates from the amalgamation of the features of pace keeping DMRG algorithm, first proposed by Luo {\it et. al}, [Phys.Rev. Lett. {\bf 91}, 049701 (2003)], and the time-step targeting (TST) algorithm by Feiguin and White [Phys. Rev. B {\bf 72}, 020404 (2005)]. Using the DTWT technique, we study the phenomena of spin-charge separation in conjugated polymers (materials for molecular electronics and spintronics), which have long-range electron-electron interactions and belong to the class of strongly correlated low-dimensional many-body systems. The issue of real time dynamics within the Pariser-Parr-Pople (PPP) model which includes long-range electron correlations has not been addressed in the literature so far. The present study on PPP chains has revealed that, (i) long-range electron correlations enable both the charge and spin degree of freedom of the electron, to propagate faster in the PPP model compared to Hubbard model, (ii) for standard parameters of the PPP model as applied to conjugated polymers, the charge velocity is almost twice that of the spin velocity and, (iii) the simplistic interpretation of long-range correlations by merely renormalizing the {\it U} value of the Hubbard model fails to explain the dynamics of doped holes/electrons in the PPP model.

Affiliated with

Also associated with

No associations

Rating

Double Time Window Targeting Technique: Real time DMRG dynamics in the PPP model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Double Time Window Targeting Technique: Real time DMRG dynamics in the PPP model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double Time Window Targeting Technique: Real time DMRG dynamics in the PPP model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-270095