205 citations · 3k across the 122 of their papers we have counts for
13 papers · 1 filter
Single-Block Renormalization Group: Quantum Mechanical Problems
M. A. Martin-Delgado, J. Rodriguez-Laguna, G. Sierra
We reformulate the density matrix renormalization group method (DMRG) in terms of a single block, instead of the standard left and right blocks used in the construction of the supe…
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…
Dualities in Spin Ladders
German Sierra, Miguel A. Martin-Delgado
We introduce a set of discrete modular transformations and in order to study the relationships between the different phases of the Heisenberg ladders obtai…
The Short Range RVB State of Even Spin Ladders: A Recurrent Variational Approach
German Sierra, Miguel A. Martin-Delgado
Using a recursive method we construct dimer and nondimer variational ansatzs of the ground state for the two-legged ladder, and compute the number of dimer coverings, the energy de…
Low-Energy Properties of Antiferromagnetic Spin-1/2 Heisenberg Ladders with an Odd Number of Legs
Beat Frischmuth, Stephan Haas, German Sierra +1
An effective low-energy description for multi-leg spin-1/2 Heisenberg ladders with an odd number of legs is proposed. Using a newly developed Monte Carlo loop algorithm and exact d…
A Rotating-Valence-Bond scenario for the 2D Antiferromagnetic Heisenberg Model
German Sierra, Miguel A. Martin-Delgado
We propose that the valence bonds forming the ground state of the 2D-AF Heisenberg model on a square lattice may rotate under the effect of the antiferromagnetic background. To tes…