摘要
对吸附了大量As的InAs(001)样品进行升降温热处理,发现在485℃时表面有从(3×1)重构到(2×4)重构的不可逆转变现象。利用扫描隧道显微镜对(3X1)重构表面分析,结果表明大量常温吸附的As从表面脱附使InAs(001)(2×4)重构表面最顶层的Asdimer也一起脱离表面,(3×1)重构表面实际上是由20%的富As(2×4)重构区域与80%的富In(4×2)重构区域组成。不可逆相变是由于As束流提供的As4原子团吸附到富In区域,使样品表面恢复N(2×4)重构相,而(2X4)蓖构相能在390~490℃温度范同内稳定存在。
For the lust tirre,the irreversible phase transition from (3 × 1) to (2 ×4) reconstructions was observed at 485℃ on the As-adsorbed,InAs (031) surfaces in the heating-up and cooling-down process.The (3 ×1) reconstructed InAs(031) surface was characterized with scanning tunneling microscopy (STM),and reflztion high energy electron diffraction. The results show that the thermal desorption of a large number of the As atoms,adsorbed at room temperature on the InAs (1301) surfaces,drogged with them quite a few As-dimers away from the (2× 4) reconstructed surfaces. In fact, the (3 × 1 ) reconstructed surfaces include 20% As-rich (2 × 4) reconstruction and 80% In-rich (4 ×2) reconstruction.The irreversible phase transition originated from the adsorption of the As4 clusters of the As-beam on the In-rich area, resulting in the (2× 4) reconstruction. We found that the (2 × 4) reconstruction was fairly stable in the 390- 490℃ range.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2013年第12期1266-1269,共4页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金资助项目(60866001)
贵州师范大学2012博士基金项目
教育部博士点基金资助项目(20105201110003)
贵州省优秀科技教育人才省长专项基金(黔省专合字(2009)114号)
贵州省科学技术基金资助项目(黔科合J字[2011]2095号)
贵州省留学人员科技项目(Z103233)