9 papers
Anderson transition in low-dimensional disordered systems driven by nonrandom long-range hopping
A. Rodriguez, V. A. Malyshev, G. Sierra +3
The single-parameter scaling hypothesis predicts the absence of delocalized states for noninteracting quasiparticles in low-dimensional disordered systems. We show analytically and…
Kondo Effect in Carbon Nanotube Single-Electron Transistors
Eugene H. Kim, German Sierra, C. Kallin
Recently, Coulomb blockade physics was observed at room temperature in a carbon nanotube single-electron transistor (H. W. Ch. Postma, et. al., Science 293, 76 (2001)). In this wor…
Absence of weak localization in two-dimensional disordered Frenkel lattices
A. Rodriguez, M. A. Martin-Delgado, J. Rodriguez-Laguna +4
The standard one-parameter scaling theory predicts that all eigenstates in two-dimensional random lattices are weakly localized. We show that this claim fails in two-dimensional di…
A Density Matrix Renormalization Group study of Excitons in Dendrimers
M. A. Martin-Delgado, J. Rodriguez-Laguna, G. Sierra
We introduce the density matrix renormalization group (DMRG) method as an efficient computational tool for one-exciton approximations with off-diagonal disorder. This method allows…
The Recurrent Variational Approach applied to the Electronic Structure of Conjugated Polymers
S. Pleutin, E. Jeckelmann, M. A. Martin-Delgado +1
In this note, first the Recurrent Variational Approach (RVA) is introduced by using as example a non-trivial spin-model, the spin-1/2 antiferromagnetic two-leg-ladder. Then, a firs…
The Density Matrix Renormalization Group, Quantum Groups and Conformal Field Theory
G. Sierra, M. A. Martin-Delgado
We present an overview of the Density Matrix Renormalization Group and its connections to Quantum Groups, Matrix Products and Conformal Field Theory. We emphasize some common forma…