Surface structures of MnAs grown on GaAs(111)B substrates
Surface structures of MnAs grown on GaAs(111)B substrates
复制标题
GaAs(111)B 衬底上生长的 MnAs 的表面结构
DOI：
10.1103/physrevb.68.115309
复制
发表时间：
2003
影响因子：
3.7
通讯作者：
Y. Garreau
中科院分区：
文献类型：
--
作者：
A. Ouerghi;M. Marangolo;M. Eddrief;S. Guyard;V. Etgens;Y. Garreau
通过分子束外延在$\mathrm{GaAs}（111）B$衬底上生长的原子平坦的MnAs外延层呈现取决于样品温度和表面化学计量的表面结构：已知的$（2\ifmmode\times\else\texttimes\fi{}2）$重构和两个新相，即，$（3\ifmmode\times\else\texttimes\fi{}1）$重建和$（2\ifmmode\times\else\texttimes\fi{}2）$和$（3\ifmmode\times\else\texttimes\fi{}1）的混合相位。$通过监测作为退火温度的函数的反射高能电子衍射图演化，可以将$（3\ifmmode\times\else\texttimes\fi{}1）$归因为As最富的相，而$（2\ifmmode\times\else\texttimes\fi{}2）$归因为As最贫的相。两个结构模型的观察重建[即，提出了$（3\ifmmode\times\else\texttimes\fi{}1）$和$（2\ifmmode\times\else\texttimes\fi{}2）]$。
Atomically flat MnAs epilayers grown on $\mathrm{GaAs}(111)B$ substrates by molecular-beam epitaxy present surface structures depending on the sample temperature and on the surface stoichiometry: the known $(2\ifmmode\times\else\texttimes\fi{}2)$ reconstruction and two new phases, i.e., a $(3\ifmmode\times\else\texttimes\fi{}1)$ reconstruction and a mixed phase of $(2\ifmmode\times\else\texttimes\fi{}2)$ and $(3\ifmmode\times\else\texttimes\fi{}1).$ By monitoring the reflection high-energy electron-diffraction diagram evolution as a function of the annealing temperature, it was possible to ascribe the $(3\ifmmode\times\else\texttimes\fi{}1)$ as being the As richest phase and the $(2\ifmmode\times\else\texttimes\fi{}2)$ as the As poorest phase. Two structural models for the observed reconstructions [i.e., $(3\ifmmode\times\else\texttimes\fi{}1)$ and $(2\ifmmode\times\else\texttimes\fi{}2)]$ are proposed.