Yanfeng Wei

摘要 高性能的非线性光学晶体是实现固体激光器波长转换的关键器件。硫属化合物在红外非线性光学材料的研究中起着不可或缺的作用。本工作筛选出了具有缺陷类金刚石结构的三元硫属化合物ZnGa2S4，并采用化学气相传输法生长了该晶体。它具有高的倍频响应(1.36 × AgGaS 2 )和宽的带隙(3.18 eV)。ZnGa 2 S 4 晶体在空气中具有良好的化学稳定性。这些特性表明ZnGa2S4具有很大的潜力成为红外非线性光学材料。

Sleep, locomotor and social activities are essential animal behaviors, but their reciprocal relationships and underlying mechanisms remain poorly understood. Here, we elicit information from a cutting-edge large-language model (LLM), generative pre-trained transformer (GPT) 3.5, which interprets 10.2-13.8% of Drosophila genes known to regulate the 3 behaviors. We develop an instrument for simultaneous video tracking of multiple moving objects, and conduct a genome-wide screen. We have identified 758 fly genes that regulate sleep and activities, including mre11 which regulates sleep only in the presence of conspecifics, and NELF-B which regulates sleep regardless of whether conspecifics are present. Based on LLM-reasoning, an educated signal web is modeled for understanding of potential relationships between its components, presenting comprehensive molecular signatures that control sleep, locomotor and social activities. This LLM-aided strategy may also be helpful for addressing other complex scientific questions.

Magnetoconductance of a gated two-dimensional electron gas (2DEG) in an inversion layer on a p-type HgCdTe film is investigated. At strong magnetic fields, characteristic features such as the quantum Hall effect of a 2DEG with single subband occupation are observed. At weak magnetic fields, the weak antilocalization effect in the ballistic regime is observed. Phase coherence time and zero-field spin-splitting are extracted following Golub’s model [L. E. Golub, Phys. Rev. B 71, 235310 (2005)]. The temperature dependence of the dephasing rate is consistent with the Nyquist mechanism.