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A model dielectric response function for metallic nanotube ropes
J. V. Alvarez, G. G. N. Angilella
We propose a model dielectric function for ropes of single-walled nanotubes distributed in a glassy graphite host medium. We study the significance of the bosonic charge excitation…
Disordered and Ordered States in a Frustrated Anisotropic Heisenberg Hamiltonian
S. Moukouri, J. V. Alvarez
We use a recently proposed perturbative numerical renormalization group algorithm to investigate ground-state properties of a frustrated three dimensional Heisenberg model on an an…
Renormalization group method for weakly coupled quantum chains: comparison with exact diagonalization
J. V. Alvarez, S. Moukouri
We show that numerical quasi-one-dimensional renormalization group allows accurate study of weakly coupled chains with modest computational effort. We perform a systematic comparis…
Anomalous percolation and quantum criticality in diluted rare-earth nickelates
J. V. Alvarez, H. Rieger, A. Zheludev
A microscopic model for the diluted spin-mixed compounds (R_xY_(1-x))_2BaNiO_5 (R=magnetic rare-earth) is studied using Quantum Monte Carlo (QMC). The ordering temperature is shown…
Insulating, superconducting and large-compressibility phases in nanotube ropes
J. V. Alvarez, J. Gonzalez
The superconducting properties of carbon nanotube ropes are studied using a new computational framework that incorporates the renormalization of intratube interactions and the effe…