Spintronics with NSN Junction of one-dimensional quantum wires : A study of Pure Spin Current and Magnetoresistance

We demonstrate possible scenarios for production of pure spin current and large tunnelling magnetoresistance ratios from elastic co-tunnelling and crossed Andreev reflection across a superconducting junction comprising of normal metal-superconductor-normal metal, where, the normal metal is a one-dimensional interacting quantum wire. We show that there are fixed points in the theory which correspond to the case of pure spin current. We analyze the influence of electron-electron interaction and see how it stabilizes or de-stabilizes the production of pure spin current. These fixed points can be of direct experimental relevance for spintronics application of normal metal-superconductor-normal metal junctions of one-dimensional quantum wires. We also calculate the power law temperature dependence of the crossed Andreev reflection enhanced tunnelling magnetoresistance ratio for the normal metal-superconductor-normal metal junction.Comment: Final version to appear in Euro. Phys. Let

A systematic stability analysis of the renormalisation group flow for the normal-superconductor-normal junction of Luttinger liquid wires

We study the renormalization group flows of the two terminal conductance of a superconducting junction of two Luttinger liquid wires. We compute the power laws associated with the renormalization group flow around the various fixed points of this system using the generators of the SU(4) group to generate the appropriate parameterization of a S-matrix representing small deviations from a given fixed point S-matrix (obtained earlier in Phys. Rev. B 77, 155418 (2008)), and we then perform a comprehensive stability analysis. In particular, for the non-trivial fixed point which has intermediate values of transmission, reflection, Andreev reflection and crossed Andreev reflection, we show that there are eleven independent directions in which the system can be perturbed, which are relevant or irrelevant, and five directions which are marginal. We obtain power laws associated with these relevant and irrelevant perturbations. Unlike the case of the two-wire charge-conserving junction, here we show that there are power laws which are non-linear functions of V(0) and V(2k_{F}) (where V(k) represents the Fourier transform of the inter-electron interaction potential at momentum k). We also obtain the power law dependence of linear response conductance on voltage bias or temperature around this fixed point.Comment: Final version to appear in Phys. Rev.

Commercial Communications Data Fusion Analysis

NPS NRP Executive SummaryThis study looks at fusing the presence and absence of emitted signals from commercial sources like AIS/Satellite-Communications/Radio to classify contacts using new data driven techniques AI/ML makes available. Naval Undersea Warfighting Development Center (UWDC)U.S. Fleet Forces Command (USFF)This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Expeditionary Domain Awareness - Intelligence Support to NECC & NECC Support to Intelligence Analysis (NECC focus)

NPS NRP Project PosterThis study will research existing online tools and determine which best fulfills NECC needs; provide enhancement solutions for the best one, and to identify concepts to leverage NECC units to support intelligence analysis and operations. Keywords: NECC, Expeditionary Domain Awareness, Intelligence, Operations, Collaboration, Portal, SIPR, Information Stream, Naval Expeditionary Combat Forces, Tribes, Database, Hadoop, AI/ML.Office of Naval Intelligence (ONI)N2/N6 - Information WarfareThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Spin transport across oxide semiconductors and antiferromagnetic oxide interfaces

Strong correlated interplay of spin, orbital and lattice degrees of freedom in complex oxide materials, both in their bulk as well as at their heterointerfaces lead to emergent phenomena, that are often unlike those found in other material systems. Such an interplay is brought by a cumulative interaction of the lattice distortion, induced strain, and different types of symmetry breaking, enabling effective control and engineering across oxide interfaces, and has led to the observation of unconventional electronic transport, magnetism, ferroelectricity, and superconductivity. This thesis studies functionally important complex oxide platforms for spin transport and explores, (i) Integration of non-volatile memory functionalities on complex oxide semiconducting Nb-doped SrTiO$_3$ (Nb:STO) for complementary memory and logic operation, (ii) Probing magnetic properties in thin-film antiferromagnetic insulator SrMnO$_3$ (SMO), with an outlook to integrate them for future antiferromagnetic spintronics and magnonics applications based on complex oxides

Expeditionary Mine Countermeasures (ExMCM) C4I Requirements (Continuation)

NPS NRP Executive SummaryExpeditionary Mine Countermeasures (ExMCM) C4I Requirements (Continuation)Naval Expeditionary Combat Command (NECC)This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Expeditionary Domain Awareness - Intelligence Support to NECC & NECC Support to Intelligence Analysis (NECC focus)

NPS NRP Executive SummaryThis study will research existing online tools and determine which best fulfills NECC needs; provide enhancement solutions for the best one, and to identify concepts to leverage NECC units to support intelligence analysis and operations. Keywords: NECC, Expeditionary Domain Awareness, Intelligence, Operations, Collaboration, Portal, SIPR, Information Stream, Naval Expeditionary Combat Forces, Tribes, Database, Hadoop, AI/ML.Office of Naval Intelligence (ONI)N2/N6 - Information WarfareThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Expeditionary Domain Awareness - Intelligence Support to NECC & NECC Support to Intelligence Analysis (NECC focus)

NPS NRP Technical ReportThis study will research existing online tools and determine which best fulfills NECC needs; provide enhancement solutions for the best one, and to identify concepts to leverage NECC units to support intelligence analysis and operations. Keywords: NECC, Expeditionary Domain Awareness, Intelligence, Operations, Collaboration, Portal, SIPR, Information Stream, Naval Expeditionary Combat Forces, Tribes, Database, Hadoop, AI/ML.Office of Naval Intelligence (ONI)N2/N6 - Information WarfareThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Innovative mnemonics in chemical education: review article

In this review article, formulae based innovative mnemonics have been discussed to create interest and remove phobia of students in the field of chemical education. Educators can use these numerous mnemonics in their teaching style in the classroom lectures after discussing conventional methods to make chemistry intriguing. Here, I have tried to focus some time economic mnemonics by including thirty-three (33) new formulae in the field of chemical education. It will encourage students to solve multiple choice type questions (MCQs) at different competitive examinations in a time economic ground. This review article emphasizes chemical education in the light of a variety of mnemonic techniques to make it metabolic, time economic and intriguing for students because the use of mnemonics in classroom lectures is an essential tool to become a distinguished educator