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Recent Publications |
2008
A.M.
Somoza, M. Ortuño and M. Pollak
Effective
temperature in relaxation of Coulomb glasses
Phys. Rev. Lett. 101, 056601 (2008).
T.C. Choy, A.M. Stoneham, M. Ortuño and
A.M. Somoza
Negative Magnetoresistance in ultrananocrystalline
diamond:Strong or Weak localization?
Appl.
Phys. Lett. 92 02120 (2008).
Selected in Virtual Journal of Nanoscale Science and Technology 12, (2008).
M.
Ortuño, M. Caravaca and A.M. Somoza,
Numerical
Study of Relaxation in Coulomb Glasses
Phys. Stat. Sol. (c) 5, No. 3, 674–679 (2008). DOI 10.1002/pssc.200777578.
2007
A.M.
Somoza, M. Ortuño and J. Prior
Universal distribution functions in two-dimensional
localized systems
Phys. Rev. Lett. 99, 116602 (2007).
2006
A.M.
Somoza, J. Prior and M. Ortuño
Conductance fluctuations in the
localized regime: Numerical study in disordered noninteracting systems
Phys. Rev. B 73,
184201 (2006).
O. del Barco, M. Ortuno ad V. Gasparian
Tunneling-time
calculations for general finite wave packets based on the presence-time
formalism
Phys. Rev. A 74, 032104 (2006).
A.M.
Somoza, M. Ortuño and M. Pollak
Collective
variable-range hopping in the Coulomb gap: Computer simulations
Phys.
Rev. B 73, 045123 (2006).
J.
Prior, A.M. Somoza and M. Ortuño
Conductance
fluctuations and corrections to the localization length in two-dimensional
localized systems
Phys.
Stat. Sol. (b) 243, 395-398 (2006).
2005
A.M.
Somoza, M. Ortuño and J. Prior
Quantum fluctuations effects in hopping
Europhys. Lett. 70,
649-655 (2005).
A.M.
Somoza and M. Ortuño
Monte Carlo method for
relaxation in electron glasses
Phys. Rev. B 72,
224202 (2005).
V.
Gasparian, B. Altshuler and M. Ortuño
Pumping
in one dimensional Kronig-Penney models
Phys.
Rev. B 72, 195309 (2005).
Selected in Virtual Journal of Nanoscale Science and Technology 12, 21
(2005).
J.
Prior, A.M. Somoza and M. Ortuño
Conductance fluctuations
and single-parameter scaling in two-dimensional disordered systems
Phys. Rev. B 72,
024206 (2005).
2004
J. Prior, M. Ortuño and A.M. Somoza
Variable-range hopping in one-dimensional systems
Fundamental
Problems in Mesoscopic Physics, Eds. I.V. Lerner et al., p. 295-308
(Kluwer, Dordrecht, 2004).
M.
Ortuño, A.M. Somoza and J. Prior
Conductance
fluctuations in one- and two-dimensional localized systems
Phys.
Stat. Sol. (b) 241,
2148-2156 (2004).
A.M.
Somoza, M. Ortuño and M. Pollak
Variable
range hopping in the Coulomb gap
Phys.
Stat. Sol. (c) 1,
42-45 (2004).
J.
Prior, A.M. Somoza and M. Ortuño
Quantum
effects in Mott’s variable range hopping
Phys.
Stat. Sol. (c) 1,
136-139 (2004).
2003
V.
Gasparian, M. Ortuño and O. Del Barco
Electronic
traversal time in nanostructures
Encyclopedia of Nanoscience and
Nanotechnology, 3, p. 193-215
(American Scientific Publishers, 2003).
M.
Pollak, A.M. Somoza and M. Ortuño
A
percolation method for computing transport properties of the Coulomb glass
Proceedings 26th Intal Conference
on the Physics of Semiconductors, D27 (IOP Publishing Limited 2003).
2002
E. Cuevas,
M. Ortuño, V. Gasparian and A. Pérez-Garrido
Fluctuations
of the correlation dimension at metal-insulator transitions
Phys. Rev. Lett. 88, 016401 (2002).
M.
Ortuño, P. Carpena, P. Bernaola, E. Muñoz and A.M. Somoza
Keyword
detection in natural languages and DNA
Europhys. Lett. 57, 759-764 (2002).
2001
E.
Cuevas, V. Gasparian and M. Ortuño
Anomalously
large critical regions in power-law random matrix ensembles
Phys. Rev. Lett. 87, 056601 (2001).
A.
Pérez-Garrido, M. Ortuño, A.M. Somoza and A. Díaz-Sánchez
Configuration
space in electron glasses
Phil. Mag. B 81, 151-162 (2001).
M.
Ortuño, J. Talamantes, E. Cuevas and A. Díaz-Sánchez
Coulomb
interactions in Anderson insulators
Phil. Mag. B 81,
1049-1064 (2001).
V.
Gasparian and M. Ortuño
Green function
formulation of the traversal time and nature of the complex time
Phil. Mag. B 81,
1191-1200 (2001).
2000
M. Ortuño y E. Cuevas
Two interacting particles
in a two-dimensional random potential
en Statistical and dynamical aspects of mesoscopic
systems,
Eds. D. Reguera et al., Spriger-Verlag, 263-70
(2000).
A. Díaz-Sánchez, A. Möbius, M. Ortuño,
A. Neklioudov y M. Schreiber
Non-ergodic effects in the
Coulomb Glass: specific heat
Phys. Rev. B, 62, 8030-7 (2000).
A. Pérez-Garrido, M. Ortuño, A. M.
Somoza y A. Díaz-Sánchez
Valleys in configuration space
of Coulomb glasses
Phys. Stat. Sol. B, 218, 25-29 (2000).
A. Díaz-Sánchez, M. Ortuño, A.
Pérez-Garrido y E. Cuevas
Phase transition in Coulomb
glasses
Phys. Stat. Sol. B, 218, 11-15 (2000).
J.D. Catalá, J. Ruiz y M. Ortuño
Dynamic model with quenched
rotational disorder in the hexagonal lattice
Phys. Stat. Sol. B, 218, 247-50 (2000).
1999
M. Ortuño and E. Cuevas
Localized to extended states
transition for two interacting particles in a two-dimensional random potential
Europhys. Lett. 46, 224-30 (1999). [ps file]
A. Díaz-Sánchez, M. Ortuño, M. Pollak,
A. Pérez-Garrido and A. Möbius
Dielectric susceptibility of the
Coulomb Glass
Phys. Rev. B 59, 910-4 (1999).
A. Pérez-Garrido, M. Ortuño, A.
Díaz-Sánchez and E. Cuevas
Numerical study of relaxation in
electron glasses
Phys. Rev. B 59, 5328-32 (1999). [pdf file]
V. Gasparian, M. Ortuño, G. Schön and U.
Simon
Tunneling time in nanostructures
513-69, in Handbook of Nanostructured Materials and
Nanotechnology,
Ed. H. S. Nalwa, Academic Press, San Diego (1999). [pdf file]
V. Gasparian, G. Schön, J. Ruiz and M.
Ortuño
Kramers-Kronig relations and the
barrier interaction time problem
European Physical Journal B 2, 283 (1999).
P. Carpena, V. Gasparian and M. Ortuño
Number of bound states of a
Kronig-Penney finite-periodic superlattice
European Physical Journal B, 8, 635-641
(1999).
E. Cuevas and M. Ortuño
Delocalization transition for
two interacting particles in a two-dimensional random potential
Ann. Phys. (Leipzig), 8, 37-40
(1999).
1998
E. Cuevas, M. Ortuño, J. Ruiz, E. Louis and J.A. Vergés
Transport regimes and critical
energies in the two-dimensional Anderson model
J. Phys.: Condensed Matter, 10, 295-303
(1998).
A. Díaz-Sánchez, A. Moebius, M. Ortuño, A. Pérez-Garrido and M. Schreiber
Coulomb glass simulations:
Creation of a set of low-energy many-particle states, non-ergodic effects in
the specific heat
Phys. Stat. Sol. B, 205, 17-9 (1998).
A. Pérez-Garrido, M. Ortuño and A. Díaz-Sánchez
Relaxation in Coulomb glasses at
finite temperature
Phys. Stat. Sol. B, 205, 31-4 (1998).
J.A. Vergés, E. Cuevas, M. Ortuño and E. Louis
Chaotic behavior induced by
point contacts in quantum dots
Phys. Rev. B (RC) 58, R10143-6 (1998).
V. Gasparian, G. Schön, J. Ruiz and M. Ortuño
On the application of the
Kramers-Kronig relations to the interaction time problem
Ann. Phys. (Leipzig) 7, 756-63
(1998).
1997
P. Carpena, V. Gasparian and M. Ortuño
Finite periodic and
quasiperiodic systems in an electric field
Z. Phys. B, 102, 425-31 (1997).
E. Cuevas, E. Louis, J.A. Vergés and M. Ortuño
Quantum fluctuations in granular
metals
Physica B, 230-2, 803-5 (1997).
A. Pérez-Garrido, M. Ortuño, E. Cuevas and J. Ruiz
Conductivity of the
Two-Dimensional Coulomb Glass
Phys. Rev. B (RC), 55, R8630-3 (1997).
E. Louis, E. Cuevas, J.A. Vergés and M. Ortuño
Mean free path and energy
fluctuations in quantum chaotic billiards
Phys. Rev. B, 56, 2120-6 (1997). [ps]
J. Ruiz, M. Ortuño, E. Cuevas and V. Gasparian
Traversal time as a function of
the size of the wavepacket
J. Phys. I France, 7, 653-61 (1997).
E. Louis, J.A. Vergés, E. Cuevas and M. Ortuño
New model of quantum chaotic
billiards: application to granular metals
Z. Phys. B, 103, 297-304 (1997).
V. Gasparian, U. Gummich, E. Jódar, J. Ruiz and M. Ortuño
Tunneling and dwell time for
one-dimensional generalized Kronig-Penney model
Physica B, 233, 72-7 (1997).
A. Pérez-Garrido, M. J. W. Dodgson, M. A. Moore, M. Ortuño and A. Díaz-Sánchez
Comment on ``Possible Global
Minimum Lattice Configurations for Thomson's Problem of Charges on a Sphere''
Phys. Rev. Lett., 79, 1417 (1997).
J.A. Vergés, E. Cuevas, E. Louis and M. Ortuño
Global quantum fluctuations in
metallic particles
Phys. Rev. B (RC), 56, R7045-8 (1997).
P. Carpena, V. Gasparian and M. Ortuño
The electronic spectrum of
quantum delta-wells superlattices in an electric field
Phys. Rev. B, 56, 14929-33 (1997).
E. Cuevas, E. Louis, M. Ortuño and J.A. Vergés
Energy fluctuations, Thouless
energy, and conductance in the Anderson model in the ballistic and diffusive
regimes
Phys. Rev. B, 56, 15853-9
(1997).
1996
V. Gasparian, M. Ortuño, E. Cuevas and J. Ruiz
Dwell time for an asymmetric
one-dimensional barrier
Solid St. Commun., 97, 791-3 (1996).
D. Badalian, V. Gasparian, A. Khachatrian, M. Ortuño, J. Ruiz and E. Cuevas
On statistics of binary alloys
in one-dimensionals quasiperiodic lattices
Physica B, 217, 127-32 (1996).
A. Pérez-Garrido, M. Ortuño, E. Cuevas and J. Ruiz
Many-particle jumps algorithm
and Thomson's problem
J. Phys. A: Math. Gen., 29, 1973-8 (1996).
E. Cuevas, V. Gasparian, M. Ortuño and J. Ruiz
Traversal time in periodically
loaded waveguides
Z. Phys. B, 100, 595-9 (1996).
I. Navarro, M. Ortuño and A. Hernando
Ferromagnetic interactions in
nanostructured systems with two different Curie temperatures
Phys. Rev. B, 53, 11656-60 (1996).
V. Gasparian, J. Ruiz, M. Ortuño and E. Cuevas
Brewster anomaly in Fibonacci
and Thue-Morse dielectric multilayers
Electromagnetics, 16, 313-22 (1996).
1995
V. Gasparian, M. Ortuño, J. Ruiz and E. Cuevas
Faraday rotation and
complex-valued transversal time for classical light waves
Phys. Rev. Lett., 75, 2312-5 (1995).
[pdf file]
M. Ortuño, E. Cuevas, J. Ruiz, V. Gasparian and M. Pollak
Conductivity in the Coulomb gap
at very low temperatures
in The Physics of Semiconductors, editado por D.J.
Lockwood, World Scientific Publishing Co., 41-4 (1995).
J. Ruiz, M. Ortuño, E. Cuevas and V. Gasparian
Monte Carlo simulation of
hopping conduction in two-dimensional Coulomb glasses
J. Phys.: Condensed Matter, 7, 639-44 (1995).
A. Egea-Guillén, R. Garcia-Molina and M.
Ortuño
Conductividad por saltos en
redes uni-, bi- and tridimensionales desordenadas espacialmente
Anales de Física, 91, 45-8 (1995).
V. Gasparian, M. Ortuño, J. Ruiz, E. Cuevas and M. Pollak
Tunneling times for
one-dimensional systems
Phys. Rev. B, 51, 6743-6 (1995).
P. Carpena, V. Gasparian and M. Ortuño
Energy spectra and level
statistics of Fibonacci and Thue-Morse chains
Phys. Rev. B, 51, 12813-6 (1995).
M. Ortuño, J. Ruiz, E. Cuevas and A. Pérez-Garrido
Numerical simulations and
conductivity of the Coulomb glass
in Hopping and related phenomena, edited by O.
Millo and Z. Ovadyahu, Racah Ins. Phys., 35-43 (1995).
1994
J. Ruiz, E. Cuevas, M. Ortuño, J.
Talamantes, M. Mochena and M. Pollak
Relaxation effects in the
Coulomb glass
J. Non-Cryst. Solids, 172-4, 445-8 (1994).
M. Ortuño, E. Cuevas and J. Ruiz
Coulomb gap in granular metals
in Hopping and related phenomena 5, World
Scientific Publishing Co., 299-303 (1994).
M. Pollak, J. Ruiz, M. Ortuño and E.
Cuevas
The activation energy of hopping
conduction
in Hopping and related phenomena 5, World
Scientific Publishing Co., 309-13 (1994).
D. Espericueta, M. Ortuño and J.
Talamantes
Comparison of algorithms to find
the low-energy states of a Coulomb glass
in Hopping and related phenomena 5, World
Scientific Publishing Co., 304-308 (1994).
M. Ortuño, M. Pollak and J. Talamantes
Low energy excitations and
non-ergodicity in the Coulomb glass
Intl. J. Modern Phys. B, 8, 923-33 (1994).
E. Cuevas, M. Ortuño, J. Ruiz, V.
Gasparian and M. Pollak
Electrode screening of the
Coulomb gap
Phil. Mag. B, 70, 1231-35 (1994).
A. Egea-Guillén, M. Ortuño and R.
Garcia-Molina
Spatial disorder dependence of
the conductance of a random resistor network
Phys. Rev. B, 50, 12520-3
(1994).
1993
J.D. Catalá, J. Ruiz and M. Ortuño
`Percolative' dynamics in the
hexagonal lattice
Z. Phys. B, 90, 369-72 (1993).
E. Cuevas, M. Ortuño and J. Ruiz
Ground state of granular metals
Phys. Rev. Lett., 71, 1871-74 (1993).
J. Ruiz, M. Ortuño and E. Cuevas
Correlations in two-dimensional
Coulomb gaps
Phys. Rev. B, 48, 10777-82 (1993).
M. Mochena, M. Pollak, J. Ruiz and M. Ortuño
Energy and dielectric relaxation
in the Coulomb gap
Physica A, 201, 178-82 (1993).
I. Ortuño, M. Ortuño and J.A. Delgado
Neural networks for block
decoding in the presence of channels with intersymbol interference
Proc. Int. Conf. of Digital Signal Processing,1,
130-4 (1993).