Search Results - subject:"Anderson transition"

Electron wave packet dynamics in twisted nonlinear ladders with correlated disorder

de Moura, F.A.B.F.; Fulco, U.L.; Lyra, M.L.; … - In: Physica A: Statistical Mechanics and its Applications 390 (2011) 4, pp. 535-540

Within a tight-binding Hamiltonian approach, we study the dynamics of one-electron wave packets in a twisted ladder geometry with adiabatic electron–phonon interaction. The electron–phonon coupling is taken into account in the time-dependent Schrödinger equation through a cubic...

Persistent link: https://www.econbiz.de/10011061433

Anderson transition in 1D systems with spatial disorder

Benhenni, Rabah; Senouci, Khaled; Bouamrane, Rachid; … - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 5, pp. 1002-1008

investigate the statistical properties of the eigenstates. It is found that an Anderson transition occurs even in 1D meaning that …

Persistent link: https://www.econbiz.de/10011058957

One-magnon excitations in Heisenberg ferromagnetic chains with power-law decaying random interactions

Lima, R.P.A.; Lyra, M.L. - In: Physica A: Statistical Mechanics and its Applications 320 (2003) C, pp. 398-406

We investigate the nature of one-magnon excitations in disordered quantum Heisenberg ferromagnetic chains with long-range interactions. The exchange coupling between a given pair of sites (i,j) is considered to be randomly distributed with asymptotic power-law decaying variance...

Persistent link: https://www.econbiz.de/10011063664

Critical helix of hierarchical structures

Ugajin, Ryuichi - In: Physica A: Statistical Mechanics and its Applications 324 (2003) 3, pp. 551-567

Electronic structures in a hierarchical helix with inter-round couplings, i.e., a multiply twisted helix, are investigated using the spectral statistics of a quantum particle. The hierarchical structure is constructed using a procedure in which a helical chain of components is twisted, producing...

Persistent link: https://www.econbiz.de/10010590765

Statistical analysis of a multiply-twisted helix

Ugajin, R.; Ishimoto, C.; Kuroki, Y.; Hirata, S.; … - In: Physica A: Statistical Mechanics and its Applications 292 (2001) 1, pp. 437-451

basis of the above distance, is shown to be proportional to r2 when r is small. The Anderson transition was investigated … strength of the on-site random potentials increases, the Anderson transition occurs. Both results support our conclusion that …

Persistent link: https://www.econbiz.de/10010874795

Anderson transition in fractal-based complexes

Ugajin, Ryuichi - In: Physica A: Statistical Mechanics and its Applications 301 (2001) 1, pp. 1-16

We investigated the Anderson transition in fractal-based complexes, which were generated using the dielectric … were analyzed and the result indicates the existence of an Anderson transition. An extended electron showing quantum chaos … that these two types of fractal-based complexes can be distinguished by the type of Anderson transition, the features of …

Persistent link: https://www.econbiz.de/10011062415

Multifractality of one electron eigen states in 1D disordered long range models

Lima, Rodrigo P.A; Lyra, Marcelo L; Cressoni, José C - In: Physica A: Statistical Mechanics and its Applications 295 (2001) 1, pp. 154-157

One investigates the spatial structure of one-electron eigenstates for the one-dimensional Anderson model with long-range off-diagonal disorder hn,m=[−1,+1]/|n−m|δ where [a,b] means a uniform random distribution between a and b. Two cases are considered according to the choices for the...

Persistent link: https://www.econbiz.de/10011063006

Anderson transition driven by running fractal dimensions in a fractal-shaped structure

Ugajin, R.; Hirata, S.; Kuroki, Y. - In: Physica A: Statistical Mechanics and its Applications 278 (2000) 3, pp. 312-326

Anderson transition in a fractal-shaped structure is driven by running fractal dimension from two to three. We analyzed … become Poissonian. This indicates the onset of quantum localization in the fractal-shaped structure, so the Anderson … transition takes place as the fractal dimension changes. The effects of introducing random potentials are also analyzed. When a …

Persistent link: https://www.econbiz.de/10010590487