Strong disorder renormalization group on fractal lattices: Heisenberg models and magnetoresistive effects in tight binding models

Details Strong disorder renormalization group on fractal lattices: Heisenberg models and magnetoresistive effects in tight binding models Strong disorder renormalization group on fractal lattices: Heisenberg models and magnetoresistive effects in tight binding models

2005-03-11

arxiv.org/abs/cond-mat/0503269v1

Phys. Rev. B72, 024205 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

19 pages, 20 figures

Scientific paper

10.1103/PhysRevB.72.024205

We use a numerical implementation of the strong disorder renormalization group (RG) method to study the low-energy fixed points of random Heisenberg and tight-binding models on different types of fractal lattices. For the Heisenberg model new types of infinite disorder and strong disorder fixed points are found. For the tight-binding model we add an orbital magnetic field and use both diagonal and off-diagonal disorder. For this model besides the gap spectra we study also the fraction of frozen sites, the correlation function, the persistent current and the two-terminal current. The lattices with an even number of sites around each elementary plaquette show a dominant $\phi_0=h/e$ periodicity. The lattices with an odd number of sites around each elementary plaquette show a dominant $\phi_0/2$ periodicity at vanishing diagonal disorder, with a positive weak localization-like magnetoconductance at infinite disorder fixed points. The magnetoconductance with both diagonal and off-diagonal disorder depends on the symmetry of the distribution of on-site energies.

Affiliated with

Also associated with

No associations

Rating

Strong disorder renormalization group on fractal lattices: Heisenberg models and magnetoresistive effects in tight binding models 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 Strong disorder renormalization group on fractal lattices: Heisenberg models and magnetoresistive effects in tight binding models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strong disorder renormalization group on fractal lattices: Heisenberg models and magnetoresistive effects in tight binding models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-344867