Topological quantum transition driven by charge-phonon coupling in higher-order topological insulators

We investigate a second-order topological quantum transition of a modified Kane-Mele model driven by electron-phonon interaction. The results show that the system parameters of the bare modified Kane-Mele model are renormalized by the electron-phonon interaction. Starting from the second-order topological phase for the bare model, the increasing electron-phonon coupling strength can drive the second-order topological insulator into a semimetal phase. Such a secondorder topological phase transition is characterized by the band-gap closing, discontinuity of averaged ferminoic number and topological invariant.Comment: 8 pages,6 figure

3-(4-Methoxy­phen­yl)-1-(2-nitrophen­yl)prop-2-en-1-one

The title compound, C16H13NO4, was prepared from 2-nitrylhypnone [systematic name: 1-(2-nitrophenyl)ethanone] and 4-methoxy­benzophenone by a Claisen–Schmidt condensation. The dihedral angle formed by the two benzene rings is 80.73 (2). The crystal packing is stabilized by inter­molecular C—H⋯O hydrogen bonds

Di-μ-aqua-bis­{diaqua­[μ-4-({4-[bis­(2-hy­droxy­eth­yl)amino]-6-chloro-1,3,5-triazin-2-yl}amino)­benzene­sulfonato]­sodium(I)}

In the dinuclear title compound, [Na2(C13H15ClN5O5S)2(H2O)6]n, two Na+ cations, disposed about a centre of inversion, are linked by two bridging water mol­ecules. The coordination geometry is based on an O5 donor set defined by four water mol­ecules and a 4-amino­benzene­sulfonate O atom in a distorted trigonal–bipyramidal geometry. In the crystal, significant O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds lead to the formation of a three-dimensional architecture

Preparation of FeO(OH) Modified with Polyethylene Glycol and Its Catalytic Activity on the Reduction of Nitrobenzene with Hydrazine Hydrate

Iron oxyhydroxide was prepared by dropping ammonia water to Fe(NO3)3.9H2O dispersed in polyethylene glycol (PEG) 1000. The catalyst was characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy and laser particle size analyzer. The results showed the catalyst modified with polyethylene glycol was amorphous. The addition of PEG during the preparation make the particle size of the catalyst was smaller and more uniform. The catalytic performance was tested in the reduction of nitroarenes to corresponding amines with hydrazine hydrate, and the catalyst showed excellent activity and stability.

Masses of doubly heavy tetraquark states with isospin = 12\frac{1}{2} and 1 and spin-parity 1+±1^{+\pm}

We apply the method of QCD sum rules to study the doubly heavy tetraquark states($QQ\bar{q}\bar{q}$) with the isospin $I = \frac{1}{2}$ and 1 and spin-parity $J^{PC}=1^{++}$ and $J^{PC}=1^{+-}$ by constructing all the $QQ\bar{q}\,\bar{q}$ tetraquark currents. The masses of the doubly bottom and charm tetraquark states are computed in the context of the two-point sum rule method incorporating the quark, gluon and mixed condensates up to dimension $10$. By the way, weak decay widths of the doubly bottom tetraquark $bb\bar{u}\bar{d}$ are also given.Comment: 12 pages, 15 figures. This article is created by revtex

3-[(E)-2-Chloro-3,3,3-trifluoro­prop-1-en-1-yl]-N-(2-fluoro­phen­yl)-2,2-dimethyl­cyclo­propane-1-carboxamide

The phenyl ring in the title compound, C15H14ClF4NO, makes a dihedral angle of 80.3 (3)° with the cyclo­propane ring. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds into chains running along the a axis