Buscar
Mostrando ítems 1-10 de 291
Quantum spherical model with competing interactions
(ELSEVIER SCIENCE BVAMSTERDAM, 2012)
We analyse the phase diagram of a quantum mean spherical model in terms of the temperature T, a quantum parameter g, and the ratio p = -J(2)/J(1) where J(1) > 0 refers to ferromagnetic interactions between first-neighbour ...
Quantum critical scaling at a Bose-glass/superfluid transition: Theory and experiment for a model quantum magnet
(AMER PHYSICAL SOCCOLLEGE PK, 2012)
In this paper we investigate the quantum phase transition from magnetic Bose Glass to magnetic Bose-Einstein condensation induced by amagnetic field in NiCl2 center dot 4SC(NH2)(2) (dichloro-tetrakis-thiourea-nickel, or ...
Spontaneous spin polatization in doped semiconductor quantum wells
(Springer, 2005-12)
We calculate the critical density of the zero-temperature, first-order ferromagnetic phase transition in n-doped GaAs/AlGaAs quantum wells. We predict that this transition could be observed in narrow quantum wells at ...
Experimental consequences of quantum critical points at high temperatures
(American Physical Society, 2015-11-23)
We study the Cr1-xRex phase diagram finding that its phase transition temperature towards an antiferromagnetic order TN follows a quantum [(xc-x)/xc]ψ law, with ψ=1/2, from the quantum critical point (QCP) at xc=0.25 up ...
Quantum Ferroelectric Instabilities in Superconducting SrTiO3
(2018)
We examine the effects of strain and cation substitution on the superconducting phase of polar semiconductors near a ferroelectric quantum phase transition with a
model that combines a strong coupling theory of ...
Quantum Discord and Information Deficit in Spin Chains
(Molecular Diversity Preservation International, 2015-03)
We examine the behavior of quantum correlations of spin pairs in a finite anisotropic XY spin chain immersed in a transverse magnetic field, through the analysis of the quantum discord and the conventional and quadratic ...
Pressure study of nematicity and quantum criticality in Sr3Ru2O7 for an in-plane field
(American Physical Society, 2013-09)
We study the relationship between the nematic phases of Sr3Ru2O7 and quantum criticality. At ambient pressure, one nematic phase is associated with a metamagnetic quantum critical end point (QCEP) when the applied magnetic ...
Universal behavior of the Shannon mutual information of critical quantum chains
(American Physical Society - APSCollege Park, 2013-07)
We consider the Shannon mutual information of subsystems of critical quantum chains in their ground states. Our results indicate a universal leading behavior for large subsystem sizes. Moreover, as happens with the ...
Precise determination of quantum critical points by the violation of the entropic area law
(AMER PHYSICAL SOC, 2011)
Finite-size scaling analysis turns out to be a powerful tool to calculate the phase diagram as well as the critical properties of two-dimensional classical statistical mechanics models and quantum Hamiltonians in one ...
Experimental observation of phase-transition-like behavior in an optical simulation of single-qubit game
(2020-08-01)
Phase-transition-like behavior in quantum games has been studied in recent years as a strategy to deal with abrupt changes in the expected payoff of quantum players. More precisely, such behavior is investigated in the ...