InAs(001)吸附表面的不可逆重构相变研究  

A-s Adsorbed InAs( 001) Surfaces and Its Irreversible Reconstruction Phase Transition

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作  者:郭祥[1] 周勋[2] 罗子江[3] 王继红[1] 周清[1] 刘珂[1] 丁召[1] 

机构地区:[1]贵州大学电信学院,贵阳550025 [2]贵州师范大学物理与电子科学学院,贵阳550001 [3]贵州财经大学教育管理学院,贵阳550004

出  处:《真空科学与技术学报》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)

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.

关 键 词:扫描隧道是微镜InAs(001) 重构 不可逆相变 

分 类 号:O414.12[理学—理论物理]

 

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