The quantum anomalous Hall (QAH) insulator is a novel topological state of matter characterized by a nonzero quantized Hall conductivity without an external magnetic field. Using first-principles calculations, we predict the QAH state in monolayers of covalent-organic frameworks based on the newly synthesized X_{3}(C_{18}H_{12}N_{6})_{2} structure where X represents 5d transition metal elements...

FDM is an AM method that currently being developed due to the flexibility of object geometry can be formed. This study aims design frame and drive XZ Head type engine. Stress simulation was carried out determine safety factor in frameXZ design. Lead screw parameters form torque, shear stress, axial critical load were calculated torque requirement driving motor. The value linear axis stepper mot...

We report our analyses of the multi-epoch (2015–2017) Atacama Large Millimeter/submillimeter Array (ALMA) archival data Class II binary system XZ Tau at Bands 3, 4, and 6. The millimeter dust-continuum images show compact, unresolved (r ≲ 15 au) circumstellar disks (CSDs) around individual stars, A B, with a projected separation ∼39 au. 12CO (2–1) emission associated those CSDs traces Keplerian...

in a typical solitonic distribution, the soliton density is distributed over the entire moleculeand the present work shows how its density can be decomposed into solitonic and antisolitoniccomponents. it is found that there exists a unique electron as soliton over the anionicnanoconductor, while there are many other solitons and antisolitons. the solitonic states are furtherdecomposed to the ca...

FeSe undergoes a transition from tetragonal to slightly orthorhombic phase at 90\,K, and becomes superconductor below 8\,K. The is sometimes called nematic because quantum oscillation, neutron, other measurements detect significant asymmetry in $x$ $y$. How nematicity affects superconductivity has recently become matter of intense speculation. Here we employ an advanced \emph{ab-initio} Green's...

in this paper we studied the thermal negativity in a two-qubit xx spin ½ chain model and xxx spin1/2 chain model(isotropic heisenberg model)spin-1/2 chain subjected to an external magnetic field inz direction. we calculate analytical relation for the thermal negativity for two qubit xx and xxx spinchain models in the external magnetic field. effects of the magnetic field and temperature on then...

We study the coherent spin-polarized transport through a zigzag-edge graphene flake (ZGF), using Hubbard model in the nearest neighbor approximation within the framework of the Green function’s technique and Landauer formalism. The system considered consists of electrode/ (ZGF)/electrode, in which the electrodes are chosen to be armchair nanoribbons. The study was performed for two types of ele...