Department of Physics

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Advanced Optical Materials

Engineering Photophenomena in Large, 3D Structures Composed of Self-Assembled van der Waals Heterostructure Flakes

In this paper, we report a simple but novel aqueous solution based 'one-pot' method for preparation of (NiFe2O4)x -(SrFe12O19)1-x nanocomposites consist of hard ferrite-soft ferrite phases. A physical mixing method has also been employed to prepare nanocomposites having same compositions. The effects of synthetic methodologies on the microstructures of the nanocomposites as well as their magnetic and microwave absorption properties have been evaluated. Crystal structures and microstructures of these composites have been investigated by using X-ray diffraction, transmission electron microscope and scanning electron microscope.In the nanocomposites, prepared by both methods, presence of nanocrystalline NiFe2O4 and SrFe12O19 phases was detected. However, nanocomposites, prepared by one-pot method, possessed better homogeneous distribution of hard and soft ferrite phases than the nanocomposites, prepared by physical mixing method. Nanocomposites, prepared by one-pot method, demonstrated significant spring exchange coupling interaction between hard and soft ferrite phases and exhibited magnetically single phase behaviour. The spring exchange coupling interaction enhanced the magnetic properties (high saturation magnetization and coercivity) and microwave absorption properties of the nanocomposites, prepared by one-pot method, in comparison with the nanocomposites prepared by physical mixing method as well as pure NiFe2O4 and SrFe12 O19 nanoparticles. Minimum reflection loss of the composite was ∼-17 dB (i.e., 98% absorption) at 8.2 GHz for an absorber thickness of 3.2 mm. © 2015 American Scientific Publishers. All rights reserved.

Journal of Nanoscience and Nanotechnology

One-pot synthesis of (NiFe2O4)x -(SrFe12O19 )1-x nanocomposites and their microwave absorption properties

CoFe2O4 nanoparticles, synthesized via a co-precipitation method at 120 °C, exhibited excellent microwave absorption properties, with minimum reflection loss of -55 dB (∼99.99%) at 9.25 GHz. To the best of our knowledge, these synthesized CoFe2O4 nanoparticles show the highest minimum reflection loss in comparison with the reported CoFe2O4 based materials. © The Royal Society of Chemistry 2015.

RSC Advances

A facile low temperature method for the synthesis of CoFe2O4 nanoparticles possessing excellent microwave absorption properties

The electromagnetic characterization of dual phase stainless steel (SS2205) containing ferrite and austenite phase has been carried out by a magnetic NDE device MagStar. The efficiency of device has been demonstrated by generating different volume fraction of phases by suitable heat-treatment of the steel. A good correlation has been found between the magnetic and microstructural parameters of heat treated SS2205 steel samples. The magnetic flux density and r.m.s. voltage of magnetic Barkhausen emissions of heat treated steel increase linearly with ferrite percentage. © 2015 IEEE.

International Conference on Signal Processing and Communication Engineering Systems - Proceedings of SPACES 2015, in Association with IEEE

Electromagnetic characterization of steels through magnetic NDE device

ACS applied materials \& interfaces

Microwave-assisted synthesis of boron and nitrogen co-doped reduced graphene oxide for the protection of electromagnetic radiation in Ku-band

In the time evolution of neutral meson systems, a perfect quantum coherence is usually assumed. The important quantities of the Bd0 system, such as sin&lt;&gt;2β and δmd, are determined under this assumption. However, the meson system interacts with its environment. This interaction can lead to decoherence in the mesons even before they decay. In our formalism this decoherence is modelled by a single parameter λ. It is desirable to re-examine the procedures of determination of sin&lt;&gt;2β and δmd in meson systems with decoherence. We find that the present values of these two quantities are modulated by λ. Re-analysis of Bd0 data from B-factories and LHCb can lead to a clean determination of λ, sin 2β and δmd. © 2015 The Authors.

Fulltext

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Re-examining sin 2β and δmd from evolution of Bd0 mesons with decoherence

The VuQ model involves the addition of a vector isosinglet up-type quark to the standard model. In this model the full Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix is 4×3. Using present flavor-physics data, we perform a fit to this full CKM matrix, looking for signals of new physics (NP). We find that the VuQ model is very strongly constrained. There are no hints of NP in the CKM matrix, and any VuQ contributions to loop-level flavor-changing b→s, b→d and s→d transitions are very small. There can be significant enhancements of the branching ratios of the flavor-changing decays t→uZ and t→cZ, but these are still below present detection levels. © 2015 American Physical Society.

Physical Review D - Particles, Fields, Gravitation and Cosmology

New-physics signals of a model with a vector-singlet up-type quark

When a model for quantum noise is exactly solvable, a Kraus (or operator-sum) representation can be derived from the spectral decomposition of the Choi matrix for the channel. More generally, a Kraus representation can be obtained from any positive-sum (or ensemble) decomposition of the matrix. Here we extend this idea to any Hermitian-sum decomposition. This yields what we call the “operator-sum-difference” (OSD) representation, in which the channel can be represented as the sum and difference of “subchannels.” As one application, the subchannels can be chosen to be analytically diagonalizable, even if the parent channel is not (on account of the Abel-Galois irreducibility theorem), though in this case the number of the OSD representation operators may exceed the channel rank. Our procedure is applicable to general Hermitian (completely positive or non-completely positive) maps and can be extended to the more general, linear maps. As an illustration of the application, we derive an OSD representation for a two-qubit amplitude-damping channel. © 2015, Springer Science+Business Media New York.

Quantum Information Processing

The operator-sum-difference representation of a quantum noise channel

We study nonclassical features in a number of spin-qubit systems including single, two and three qubit states, as well as an N qubit Dicke model and a spin-1 system, of importance in the fields of quantum optics and information. This is done by analyzing the behavior of the well known Wigner, P, and Q quasiprobability distributions on them. We also discuss the not so well known F function and specify its relation to the Wigner function. Here we provide a comprehensive analysis of quasiprobability distributions for spin-qubit systems under general open system effects, including both pure dephasing as well as dissipation. This makes it relevant from the perspective of experimental implementation. © 2015 Elsevier Inc..

Annals of Physics

Quasiprobability distributions in open quantum systems: Spin-qubit systems

A quantum error-correcting code is a subspace C such that allowed errors acting on any state in C can be corrected. A quantum code for which state recovery is only required up to a logical rotation within C can be used for the detection of errors, but not for quantum error correction. Such a code with a stabilizer structure, which we call an "ambiguous stabilizer code" (ASC), can nevertheless be useful for the characterization of quantum dynamics (CQD). The use of ASCs can help lower the size of CQD probe states used, but at the cost of an increased number of operations. © 2015 American Physical Society.