`Unhinging' the surfaces of higher-order topological insulators and superconductors

We show that the chiral Dirac and Majorana hinge modes in three-dimensional higher-order topological insulators (HOTIs) and superconductors (HOTSCs) can be gapped while preserving the protecting $\mathsf{C}_{2n}\mathcal T$ symmetry upon the introduction of non-Abelian surface topological order. In both cases, the topological order on a single side surface breaks time reversal symmetry, but appears with its time-reversal conjugate on alternating sides in a $\mathsf{C}_{2n}\mathcal T$ preserving pattern. In the absence of the HOTI/HOTSC bulk, such a pattern necessarily involves gapless chiral modes on hinges between $\mathsf{C}_{2n}\mathcal T$-conjugate domains. However, using a combination of $K$-matrix and anyon condensation arguments, we show that on the boundary of a 3D HOTI/HOTSC these topological orders are fully gapped and hence `anomalous'. Our results suggest that new patterns of surface and hinge states can be engineered by selectively introducing topological order only on specific surfaces

Internet of Things and its enhanced data security

The Internet of Things (IoT), an emerging global Internet-based technical architecture facilitating the exchange of information, goods and services in the internet world has an impact on the security and privacy of the involved stakeholders. Measures ensuring the architectures resilience to attacks, data authentication, and access control and client privacy need to be established. This paper includes a survey of IoT and various security issues related to it. Furthermore, out of all security issues, concern over data authentication and transfer is taken into consideration. Here we will discuss the idea for two levels of security in form of two different approaches i.e. Advance Encryption Standards (AES) and the Steganography approach via an image and the simulating of these two logics in the MATLAB

Anomalous gapped boundaries between surface topological orders in higher-order topological insulators and superconductors with inversion symmetry

We show that the gapless boundary signatures—namely, chiral/helical hinge modes or localized zero modes—of three-dimensional higher-order topological insulators and superconductors with inversion symmetry can be gapped without symmetry breaking upon the introduction of non-Abelian surface topological order. In each case, the fractionalization pattern that appears on the surface is “anomalous” in the sense that it can be made consistent with symmetry only on the surface of a three-dimensional higher-order insulator/superconductor. Our results show that the interacting manifestation of higher-order topology is the appearance of “anomalous gapped boundaries” between distinct topological orders whose quasiparticles are related by inversion, possibly in conjunction with other protecting symmetries such as time-reversal symmetry and charge conservation

3-D Inorganic Crystal Structure Generation and Property Prediction via Representation Learning

Generative models have been successfully used to synthesize completely novel images, text, music and speech. As such, they present an exciting opportunity for the design of new materials for functional applications. So far, generative deep-learning methods applied to molecular and drug discovery have yet to produce stable and novel 3-D crystal structures across multiple material classes. To that end, we herein present an autoencoder-based generative deep-representation learning pipeline for geometrically optimized 3-D crystal structures that simultaneously predicts the values of eight target properties. The system is highly general, as demonstrated through creation of novel materials from three separate material classes: binary alloys, ternary perovskites and Heusler compounds. Comparison of these generated structures to those optimized via electronic-structure calculations shows that our generated materials are valid and geometrically optimized

Unhinging the Surfaces of Higher-Order Topological Insulators and Superconductors

We show that the chiral Dirac and Majorana hinge modes in three-dimensional higher-order topological insulators (HOTIs) and superconductors (HOTSCs) can be gapped while preserving the protecting C2nT symmetry upon the introduction of non-Abelian surface topological order. In both cases, the topological order on a single side surface breaks time-reversal symmetry, but appears with its time-reversal conjugate on alternating sides in a C2nT preserving pattern. In the absence of the HOTI/HOTSC bulk, such a pattern necessarily involves gapless chiral modes on hinges between C2nT-conjugate domains. However, using a combination of K-matrix and anyon condensation arguments, we show that on the boundary of a 3D HOTI/HOTSC these topological orders are fully gapped and hence “anomalous.” Our results suggest that new patterns of surface and hinge states can be engineered by selectively introducing topological order only on specific surfaces

Emergent Energy Storage Sector in the Developing World: a Technological and Strategic Perspective

With the focus on clean energy, efficient devices and electric mobility solutions, the market for energy storage is on the rise in the developing world. In this paper, the requirements of Indian energy storage market have been highlighted based on the different categories of applications. An in-depth study of the utilitarian advantages and disadvantages of different energy storage technologies has been conducted. Based on this, suitable energy storage technologies for different applications have been suggested. We have further delved into the elements required for all the feasible energy storage technologies. The availability of strategic reserves of these minerals in India have been examined. We have calculated the elemental requirements for different technologies, normalized to their energy storage capacity. Finally, we have suggested technologies to achieve a best-case scenario for the Indian energy storage sector from technological as well as a strategic viewpoint, minimizing the import dependency of raw materials

‘Unhinging’ the surfaces of higher-order topological insulators and superconductors

We show that the chiral Dirac and Majorana hinge modes in three-dimensional higher-ordertopological insulators (HOTIs) and superconductors (HOTSCs) can be gapped while preservingthe protectingC2nTsymmetry upon the introduction of non-Abelian surface topological order.In both cases, the topological order on a single side surface breaks time reversal symmetry, butappears with its time-reversal conjugate on alternating sides in aC2nTpreserving pattern. In theabsence of the HOTI/HOTSC bulk, such a pattern necessarily involves gapless chiral modes onhinges betweenC2nT-conjugate domains. However, using a combination ofK-matrix and anyoncondensation arguments, we show that on the boundary of a 3D HOTI/HOTSC these topologicalorders are fully gapped and hence ‘anomalous’. Our results suggest that new patterns of surface andhinge states can be engineered by selectively introducing topological order only on specific surfaces

Creating Executable Agent-Based Models Using SysML

Abstract. Simulation plays an important role in the analysis of alternatives during the early phases of systems engineering activities. This is especially true for endeavors in the system of systems realm where there is even more need for simulation to characterize interdependencies. In this paper, we develop a generic framework to translate a SysML conceptual model to an executable agent-based simulation model. We demonstrate the translation using a simplified air traffic management problem. Along with the potential advantages, we also identify major challenges and possible mismatches in accomplishing a suitable translation for real-world systems of systems