8,016 research outputs found
Thermodynamics of spin-orbit-coupled Bose-Einstein condensates
In this paper we develop a quantum field approach to reveal the thermodynamic
properties of the trapped BEC with the equal Rashba and Dresselhaus spin-orbit
couplings. In the experimentally-feasible regime, the phase transition from the
separate phase to the single minimum phase can be well driven by the tunable
temperature. Moreover, the critical temperature, which is independent of the
trapped potential, can be derived exactly. At the critical point, the specific
heat has a large jump and can be thus regarded as a promising candidate to
detect this temperature-driven phase transition. In addition, we obtain the
analytical expressions for the specific heat and the entropy in the different
phases. In the single minimum phase, the specific heat as well as the entropy
are governed only by the Rabi frequency. However, in the separate phase with
lower temperature, we find that they are determined only by the strength of
spin-orbit coupling. Finally, the effect of the effective atom interaction is
also addressed. In the separate phase, this effective atom interaction affects
dramatically on the critical temperature and the corresponding thermodynamic
properties.Comment: 8 pages, 6 figure
The weld seam detection method based on the infocrnet model
Weld seam detection is particularly crucial within industrial systems, as it promptly reflects the quality of product fabrication and performance, ensuring the final metallurgical product’s quality while mitigating potential losses stemming from product quality issues. This paper proposed the InfoFPN Cross Refinement Network (InfoCRNet) for the weld seam detection, achieving an accuracy rate of 98,90% and F1 score of 98,85 %
Enhancement of magnetoresistance in manganite multilayers
Magnanite multilayers have been fabricated using La0.67Ca0.33MnO3 as the
ferromagnetic layer and Pr0.7Ca0.3MnO3 and Nd0.5Ca0.5MnO3 as the spacer layers.
All the multilayers were grown on LaAlO3 (100) by pulse laser deposition. An
enhanced magnetoresistnace (defined (RH- R0)/R0) of more than 98% is observed
in these multilayers. Also a low field magnetoresistance of 41% at 5000 Oe is
observed in these multilayer films. The enhanced MR is attributed to the
induced double exchange in the spacer layer, which is giving rise to more
number of conducting carriers. This is compared by replacing the spacer layer
with LaMnO3 where Mn exists only in 3+ state and no enhancement is observed in
the La0.67Ca0.33MnO3 / LaMnO3 multilayers as double exchange mechanism can not
be induced by external magnetic fields.Comment: 13 pages, 5 Figure
Two-Color Coherent Photodissociation of Nitrogen Oxide in Intense Laser Fields
A simple one-dimensional semi-classical model with a Morse potential is used
to investigate the possibility of two-color infrared multi-photon dissociation
of vibrationally excited nitrogen oxide. The amplitude ratio effects and
adiabatic effects are investigated. Some initial states are found to have
thresholds smaller than expected from single-mode considerations and multiple
thresholds exist for initial states up to 32.
PACS: 42.50.HzComment: 3 pages, old papers, add source files to replace original postscrip
Overview of Quantum Error Prevention and Leakage Elimination
Quantum error prevention strategies will be required to produce a scalable
quantum computing device and are of central importance in this regard. Progress
in this area has been quite rapid in the past few years. In order to provide an
overview of the achievements in this area, we discuss the three major classes
of error prevention strategies, the abilities of these methods and the
shortcomings. We then discuss the combinations of these strategies which have
recently been proposed in the literature. Finally we present recent results in
reducing errors on encoded subspaces using decoupling controls. We show how to
generally remove mixing of an encoded subspace with external states (termed
leakage errors) using decoupling controls. Such controls are known as ``leakage
elimination operations'' or ``LEOs.''Comment: 8 pages, no figures, submitted to the proceedings of the Physics of
Quantum Electronics, 200
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