Zhou Wei, Chen Xiao-Jia, Zhang Jian-Bo, Li Xin-Hua, Wang Yu-Qi, Goncharov Alexander F
Key Laboratory of Materials Physics and Center for Energy Matter in Extreme Environments, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.
1] Key Laboratory of Materials Physics and Center for Energy Matter in Extreme Environments, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China [2] Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China.
Sci Rep. 2014 Sep 25;4:6472. doi: 10.1038/srep06472.
The structural, vibrational, and electronic properties of GaAs nanowires have been studied in the metastable wurtzite phase via Resonant Raman spectroscopy and synchrotron X-ray diffraction measurements in diamond anvil cells under hydrostatic conditions between 0 and 23 GPa. The direct band gap E0 and the crystal field split-off gap E0 + Δ of wurtzite GaAs increase with pressure and their values become close to those of zinc-blende GaAs at 5 GPa, while being reported slightly larger at lower pressures. Above 21 GPa, a complete structural transition from the wurtzite to an orthorhombic phase is observed in both Raman and X-ray diffraction experiments.
通过在金刚石对顶砧池中，于0至23吉帕的静水压力条件下进行共振拉曼光谱和同步加速器X射线衍射测量，对亚稳纤锌矿相的砷化镓纳米线的结构、振动和电子性质进行了研究。纤锌矿相砷化镓的直接带隙E0和晶体场分裂带隙E0 + Δ随压力增加，在5吉帕时其值接近闪锌矿相砷化镓的值，不过据报道在较低压力下略大。在21吉帕以上，在拉曼和X射线衍射实验中均观察到从纤锌矿相到正交相的完全结构转变。
