Zobrazeno 1 - 10
of 521
pro vyhledávání: '"Allès, B."'
Publikováno v:
Phys. Rev. B 108, 134404 (2023)
We study by numerical simulation the magnetic order in ensembles of randomly packed magnetic spherical particles which, induced by their uniaxial anisotropy in the strong coupling limit, behave as Ising dipoles. We explore the role of the frozen diso
Externí odkaz:
http://arxiv.org/abs/2307.10047
The effective action of the SU(N) Polyakov loop model in the strong coupling region and in the static limit for the quark determinant can be mapped onto the Ising model in any dimensions, with the Ising variables attached on the links of the lattice.
Externí odkaz:
http://arxiv.org/abs/2307.06641
Publikováno v:
Phys. Rev. B 102, 184423 (2020)
We study random dense packings of Heisenberg dipoles by numerical simulation. The dipoles are at the centers of identical spheres that occupy fixed random positions in space and fill a fraction $\Phi$ of the spatial volume. The parameter $\Phi$ range
Externí odkaz:
http://arxiv.org/abs/2007.14353
Publikováno v:
Phys. Rev. B 100, 134409 (2019)
We study random close packed systems of magnetic spheres by Monte Carlo simulations in order to estimate their phase diagram. The uniaxial anisotropy of the spheres makes each of them behave as a single Ising dipole along a fixed easy axis. We explor
Externí odkaz:
http://arxiv.org/abs/1909.13573
Publikováno v:
Phys. Rev. D 98, 114508 (2018)
The action of the 2d O(3) non-linear sigma model on the lattice in a bath of particles, when expressed in terms of standard O(3) degrees of freedom, is complex. A reformulation of the model in terms of new variables that makes the action real is pres
Externí odkaz:
http://arxiv.org/abs/1808.07810
Autor:
Alonso, J. J., Alles, B.
Using tempered Monte Carlo simulations, we study the the spin-glass phase of dense packings of Ising dipoles pointing along random axes. We consider systems of L^3 dipoles (a) placed on the sites of a simple cubic lattice with lattice constant $d$, (
Externí odkaz:
http://arxiv.org/abs/1610.09131
Publikováno v:
Phys. Rev. B 90, 184421 (2014)
The validity of the Haldane's conjecture entails that the mass gap of the 2-dimensional O(3) non-linear sigma model with a $\theta$-term must tend to zero as $\theta$ approaches the value $\pi$ by following a precise law. In the present paper we extr
Externí odkaz:
http://arxiv.org/abs/1409.1704
Publikováno v:
PoS LATTICE 2013: 338, 2013
Based on character decomposition, a dual transformation is introduced leading to two formulations of the theory which should allow for a removal/softening of the sign problem in the original version. Very preliminar numerical results are commented an
Externí odkaz:
http://arxiv.org/abs/1311.4292
Autor:
Alles, B.
Publikováno v:
Phys. Rev. D 85, 047501 (2012)
Contrary to a widespread belief, measures of velocity can yield a value larger than $c$, the instantaneous light speed in vacuum, without contradicting Einstein's relativity. Nevertheless, the effect turns out to be too small to explain the recently
Externí odkaz:
http://arxiv.org/abs/1111.0805
Publikováno v:
Quantum Information Processing: Volume 11, Issue 1 (2012), Page 211-227
The conditions under which entanglement becomes maximal are sought in the general one--dimensional quantum random walk with two walkers. Moreover, a one--dimensional shift operator for the two walkers is introduced and its performance in generating e
Externí odkaz:
http://arxiv.org/abs/1011.6023