189 citations · 740 across the 18 of their papers we have counts for
18 papers
Emergent Symmetry at the Néel to Valence-Bond-Solid Transition
Adam Nahum, P. Serna, J. T. Chalker +2
We show numerically that the `deconfined' quantum critical point between the Néel antiferromagnet and the columnar valence-bond-solid, for a square lattice of spin-1/2s, has an eme…
Deconfined Quantum Criticality, Scaling Violations, and Classical Loop Models
Adam Nahum, J. T. Chalker, P. Serna +2
Numerical studies of the Néel to valence-bond solid phase transition in 2D quantum antiferromagnets give strong evidence for the remarkable scenario of deconfined criticality, but…
Slow light transmission in one-dimensional periodic structures
O. del Barco, M. Ortuño
We have analyzed the transmission properties of pulses through one-dimensional periodic structures in order to systematically explore the best conditions to achieve the maximum del…
Green functions of interacting systems in the strongly localized regime
A. N. Somoza, M. Ortuño, V. Gasparian +1
We have developed an approach to calculate the single-particle Green function of a one-dimensional many-body system in the strongly localized limit at zero temperature. Our approac…
Phase transitions in 3D loop models and the model
Adam Nahum, J. T. Chalker, P. Serna +2
We consider the statistical mechanics of a class of models involving close-packed loops with fugacity on three-dimensional lattices. The models exhibit phases of two types as a…
Loop models with crossings
Adam Nahum, P. Serna, A. M. Somoza +1
The universal behaviour of two-dimensional loop models can change dramatically when loops are allowed to cross. We study models with crossings both analytically and with extensive…
Quantum Coulomb gap in low dimensions
M. Pino, A. M. Somoza, M. Ortuño
We study the single-particle density of states of one-dimensional and two-dimensional quantum disordered systems with long-range interactions. We consider a interactio…
Effects of many-electron jumps in relaxation and conductivity of Coulomb glasses
J. Bergli, A. M. Somoza, ans M. Ortuno
A numerical study of the energy relaxation and conductivity of the Coulomb glass is presented. The role of many-electron transitions is studied by two complementary methods: a kine…
Spin quantum Hall effect and plateau transitions in multilayer network models
J. T. Chalker, M. Ortuño, A. M. Somoza
We study the spin quantum Hall effect and transitions between Hall plateaus in quasi two-dimensional network models consisting of several coupled layers. Systems exhibiting the spi…
Crossover from diffusive to strongly localized regime in two-dimensional systems
A. M. Somoza, J. Prior, M. Ortuno +1
We have studied the conductance distribution function of two-dimensional disordered noninteracting systems in the crossover regime between the diffusive and the localized phases. T…
Random Walks and Anderson Localisation in a Three-Dimensional Class C Network Model
M. Ortuño, A. M. Somoza, J. T. Chalker
We study the disorder-induced localisation transition in a three-dimensional network model that belongs to symmetry class C. The model represents quasiparticle dynamics in a gaples…
Fluctuations of the correlation dimension at metal-insulator transitions
E. Cuevas, M. Ortuno, V. Gasparian +1
We investigate numerically the inverse participation ratio, , of the 3D Anderson model and of the power-law random banded matrix (PRBM) model at criticality. We found that the…
Anomalously large critical regions in power-law random matrix ensembles
E. Cuevas, V. Gasparian, M. Ortuno
We investigate numerically the power-law random matrix ensembles. Wavefunctions are fractal up to a characteristic length whose logarithm diverges asymmetrically with different exp…
Non-ergodic effects in the Coulomb glass: specific heat
A. Díaz-Sánchez, A. Möbius, M. Ortuño +2
We present a numerical method for the investigation of non-ergodic effects in the Coulomb glass. For that, an almost complete set of low-energy many-particle states is obtained by…
Dielectric susceptibility of the Coulomb-glass
A. Diaz-Sanchez, M. Ortuno, M. Pollak +2
We derive a microscopic expression for the dielectric susceptibility of a Coulomb glass, which corresponds to the definition used in classical electrodynamics, the derivative o…
Numerical study of relaxation in electron glasses
A. Perez-Garrido, M. Ortuno, A. Diaz-Sanchez +1
We perform a numerical simulation of energy relaxation in three-dimensional electron glasses in the strongly localized regime at finite temperatures. We consider systems with no in…
Localized to extended states transition for two interacting particles in a two-dimensional random potential
M. Ortuno, E. Cuevas
We show by a numerical procedure that a short-range interaction induces extended two-particle states in a two-dimensional random potential. Our procedure treats the interaction…
Coulomb glass simulations: Creation of a set of low-energy many-particle states, non-ergodic effects in the specific heat
A. Díaz-Sánchez, A. Möbius, M. Ortuño +2
We have implemented a new numerical method to obtain the low-energy many-particle states of the Coulomb glass. First, this method creates an initial set of low-energy states by a h…