Department of Physics

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We investigated magnetic and thermal transport properties of bulk FeVO4 multiferroic systems using temperature-dependent magnetic and thermal conductivity measurements. These studies exhibit long-range magnetic ordering with two successive ferroic orderings at 22 and 15 K. The temperature dependence of thermal conductivity shows a phonon-assisted peak at ∼ 30 K with an additional anomaly near ∼22 K. The Debye-Einstein phonon model fits suggest that the main contribution to thermal conductivity is coming from the acoustic phonons at low temperatures, whereas optical phonon contribution is coming at high temperatures. The onset of thermal conductivity at 22 K is associated with antiferromagnetic ferroic ordering and suggests strong coupling between magnetic ordering and phonons in FeVO4 multiferroic. © 1965-2012 IEEE.

World University root node

IEEE Transactions on Magnetics

Magnetic structure and thermal conductivity of FeVO4 multiferroic

Characterizing noisy quantum processes is important to quantum computation and communication (QCC), since quantum systems are generally open. To date, all methods of characterization of quantum dynamics (CQD), typically implemented by quantum process tomography, are off-line, i.e., QCC and CQD are not concurrent, as they require distinct state preparations. Here we introduce a method, "quantum error correction based characterization of dynamics," in which the initial state is any element from the code space of a quantum error correcting code that can protect the state from arbitrary errors acting on the subsytem subjected to unknown dynamics. The statistics of stabilizer measurements, with possible unitary preprocessing operations, are used to characterize the noise, while the observed syndrome can be used to correct the noisy state. Our method requires at most 2(4n-1) configurations to characterize arbitrary noise acting on n qubits. © 2015 American Physical Society.

Fulltext

Physical Review A - Atomic, Molecular, and Optical Physics

Characterization of quantum dynamics using quantum error correction

We report on the structure and physical properties of the polycrystalline PdTe superconductor, which is synthesized by the solid state reaction route via the quartz vacuum encapsulation technique at 750 °C. The as synthesized compound is crystallized in hexagonal crystal structure with P63/mmc space group. Both transport and magnetic measurements showed that PdTe is a bulk superconductor below 4.5 K. Isothermal magnetization (MH) and magneto-transport (R(T)H) measurements provided the values of the lower (Hc1) and upper (Hc2) critical fields as 250 Oe and 1200 Oe respectively at 2 K, establishing that the compound is clearly a type-II superconductor. The coherence length (ξ0) and Ginzburg-Landau parameter (κ) are estimated from the experimentally determined upper and lower critical fields, and are 449. © 2015 IOP Publishing Ltd.

Superconductor Science and Technology

PdTe: A 4.5 K type-II BCS superconductor

We report on the fabrication and observation of emergent opto-electronic phenomena in three dimensional, micron-sized van der Waals heterostructures self-assembled from atomic layers of graphene and hexagonal boron nitride in varying ratios. © 2015 OSA.

Conference on Lasers and Electro-Optics Europe - Technical Digest

Emergent photophenomena in three dimensional van der Waals heterostructures

We prepared monolayers of iron oxide nanoparticles via self-assembly on a bare silicon wafer and on a vanadium film sputter deposited onto a plane sapphire substrate. The magnetic configuration of nanoparticles in such a dense assembly was investigated by polarized neutron reflectivity. A theoretical model fit shows that the magnetic moments of nanoparticles form quasi domain-like configurations at remanence. This is attributed to the dipolar coupling amongst the nanoparticles. © 2015 IOP Publishing Ltd.

Journal of Physics Condensed Matter

Polarized neutron reflectivity from monolayers of self-assembled magnetic nanoparticles

In this paper, we report a simple but novel aqueous solution based 'one-pot' method for preparation of (Ni0.65Zn0.35Fe2O4)x-(BaFe12O19)1-x nanocomposites consisting of hard ferrite-soft ferrite phases. Nanocomposites, having same compositions, have also been prepared by employing a physical mixing method. X-ray diffraction analysis showed the presence of nanocrystalline Ni0.65Zn0.35Fe2O4 and BaFe12O19 phases in the composites, prepared by both methods. However, transmission electron microscopic and scanning electron microscopic analysis revealed that, nanocomposites, prepared by one-pot method, possessed better homogeneous intimacy of Ni0.65Zn0.35Fe2O4 and BaFe12O19 phases than that of the nanocomposites, prepared by physical mixing method. Nanocomposites, prepared by one-pot method, have shown magnetically single phase behaviour with good spring exchange coupling interaction between hard and soft ferrite phases. These composites possessed enhanced magnetic properties with high saturation magnetization as well as high coercivity. These nanocomposites also exhibited very good microwave absorption properties in the X-band region. Composite having composition (Ni0.65Zn0.35Fe2O4)0.85-(BaFe12O19)0.15 showed the minimum reflection loss of ~-21dB (&gt;99% absorption) at 9.86GHz for absorber thickness of 3.05mm. Magnetic and microwave absorption properties of the nanocomposites, prepared by one-pot method, were found be superior to those of the nanocomposites prepared by physical mixing method as well as pure Ni0.65Zn0.35Fe2O4 and BaFe12O19 nanoparticles. © 2015 Elsevier B.V.

Powder Technology

A novel 'one-pot' synthetic method for preparation of (Ni0.65Zn0.35Fe2O4)x-(BaFe12O19)1-x nanocomposites and study of their microwave absorption and magnetic properties

The important quantities of the B0d system, such as sin2β and Δmd, are determined under the assumption of perfect quantum coherence. However, any real system interacts with its environment and this interaction can lead to decoherence. It is therefore desirable to re-examine the procedures of determination of sin2β and Δmd in meson systems with decoherence. We find that the present values of these two quantities are modulated by the decoherence parameter λ. Re-analysis of B0d data from B-factories and LHCb can lead to a clean determination of λ, sin2β and Δmd. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

Proceedings of Science

Effect of decoherence on clean determination of sin2β and Δmd

We consider VuQ model which involves addition of a vector isosinglet t' quark to the standard model. In this model the full CKM quark mixing matri× is 4 × 3. Using present flavor-physics data, we perform a fit to this full CKM matrix. We find that the current flavor data puts stringent constraints on the VuQ model. There are no hints of new physics in the CKM matrix. Furthermore, the fit to the data indicates that any new physics contributions to b → s, b → d and s → d transitions are very small. There can be significant enhancements of the branching ratios of t → uZ and t → cZ decays, but these are still below present detection levels. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

New-physics signals of a model with an isosinglet vector-like t' quark

Correlations exhibited by neutrino oscillations are studied via quantum-information theoretic quantities. We show that the strongest type of entanglement, genuine multipartite entanglement, is persistent in the flavor changing states. We prove the existence of Bell-type nonlocal features, in both its absolute and genuine avatars. Finally, we show that a measure of nonclassicality, dissension, which is a generalization of quantum discord to the tripartite case, is nonzero for almost the entire range of time in the evolution of an initial electron-neutrino. Via these quantum-information theoretic quantities, capturing different aspects of quantum correlations, we elucidate the differences between the flavor types, shedding light on the quantum-information theoretic aspects of the weak force. © 2015, The Author(s).

European Physical Journal C

A quantum-information theoretic analysis of three-flavor neutrino oscillations: Quantum entanglement, nonlocal and nonclassical features of neutrinos

We describe the microphysics, phenomenology, and astrophysical implication of a B-field induced unpairing effect that may occur in magnetars, if the local B field in the core of a magnetar exceeds a critical value Hc2. Using the Ginzburg-Landau theory of superconductivity, we derive the Hc2 field for proton condensate taking into the correction (≤30%) which arises from its coupling to the background neutron condensate. The density dependence of pairing of proton condensate implies that Hc2 is maximal at the crust-core interface and decreases towards the center of the star. As a consequence, magnetar cores with homogenous constant fields will be partially superconducting for "medium-field" magnetars (1015≤B≤5×1016G) whereas "strong-field" magnetars (B>5×1016G) will be void of superconductivity. The neutrino emissivity of a magnetar's core changes in a twofold manner: (i) the B-field assisted direct Urca process is enhanced by orders of magnitude, because of the unpairing effect in regions where B≥Hc2; (ii) the Cooper-pair breaking processes on protons vanish in these regions and the overall emissivity by the pair-breaking processes is reduced by a factor of only a few. © 2015 American Physical Society.