Spin-Dependent Polaron Dynamics in Organic Ferromagnets.

The spin-dependent polaron dynamics in organic ferromagnets under driven electric fields are investigated by using the extended Su-Schrieffer-Heeger (SSH) model coupled with a nonadiabatic dynamics method. It is found that the spin-down polaron with the same spin orientation as the radicals drifts faster than the spin-up one under the same driven electric field. In an applicable range of driven electric fields, the velocity of the spin-down polaron is about 3.4 times that of the spin-up one. The dynamical property of the polaron with each spin (up or down) is asymmetric upon the reversal of the driven electric fields. The diverse dynamical properties of polarons with specific spins can be attributed to the spin nondegenerate polaron energy levels, the dipole moment generated by the asymmetrical polaron charge distributions and the strong electron-lattice coupling in organic ferromagnets. Our findings are expected to be useful for improving organic ferromagnet based spintronic devices.

Rectification inversion in oxygen substituted graphyne-graphene-based heterojunctions.

Current rectification is found in oxygen-substituted zigzag graphyne nanoribbon/hydrogen-terminated zigzag graphene nanoribbon heterostructure junctions, from the application of nonequilibrium Green's function formalism combined with density functional theory. This behavior could be tuned by varying the number and location of oxygen atoms in the zigzag graphyne nanoribbon parts, and the rectification direction could be reversed due to the parity limitation tunneling effect. Moreover, an obvious negative differential resistance behavior is found and may be explained by two different mechanisms.

[Study on differentiation and extract determination of Porcellio scaber and Armadillidium vulgare].

OBJECTIVE: To identify consistency of the composition and efficacy of Porcellio scaber and Armadillidium vulgare and provide reference for the safe and scientific use of the medicinal material. METHODS: Identified the Porcellio scaber and the Armadillidium vulgare with the method of characteristics; Compared the two chemical composition by thin layer method; Determined the extract by water and ethanol using the pharmacopoeia extract method. RESULTS: Porcellio scaber and Armadillidium vulgare were two varieties, they had similar chemical composition, the water and ethanol extract were the same. CONCLUSION: The compostion and efficary of Porcellio scaber and Armadillidium vulgare are the same, and these two varieties can be mixed or used alone.