Two-dimensional retrieval methods for ultrafast imaging of molecular structure using laser-induced electron diffraction.

Molecular structural retrieval based on electron diffraction has been proposed to determine the atomic positions of molecules with sub-angstrom spatial and femtosecond temporal resolutions. Given its success on small molecular systems, in this work, we point out that the accuracy of structure retrieval is constrained by the availability of a wide range of experimental data in the momentum space in all molecular systems. To mitigate the limitations, for laser-induced electron diffraction, here we retrieve molecular structures using two-dimensional (energy and angle) electron momentum spectra in the laboratory frame for a number of small molecular systems, which have previously been studied with 1D methods.

Spin current generation and relaxation in a quenched spin-orbit-coupled Bose-Einstein condensate.

Understanding the effects of spin-orbit coupling (SOC) and many-body interactions on spin transport is important in condensed matter physics and spintronics. This topic has been intensively studied for spin carriers such as electrons but barely explored for charge-neutral bosonic quasiparticles (including their condensates), which hold promises for coherent spin transport over macroscopic distances. Here, we explore the effects of synthetic SOC (induced by optical Raman coupling) and atomic interactions on the spin transport in an atomic Bose-Einstein condensate (BEC), where the spin-dipole mode (SDM, actuated by quenching the Raman coupling) of two interacting spin components constitutes an alternating spin current.

Cochlear implantation effect on deaf children with gap junction protein beta 2 gene mutation.

Background: The popularization and promotion of gene diagnosis technology makes it possible to detect deafness genes for children with congenital hearing impairment, and the proportion of gap junction protein beta 2 (GJB2) gene mutations in cochlear implant patients is 26.5%. We did follow-up evaluation on auditory rehabilitation effect for all 31 deaf children with GJB2 gene mutation after cochlear implantation to provide a reference for such patients.