摘要
The electronic density decay lengths of freestanding Pb films are investigated by first-principles calculations.The results show that,like surface energy and work function,the electronic density decay lengthλexhibits pronounced oscillatory behavior as a function of film thickness and this is expected to have an impact on surface chemical reactivity.For freestanding Pb(111)films,λoscillates following a bilayer pattern interrupted by crossovers,and the separation between two neighbor crossovers is 9 monolayers.For the films on Si(111)substrates,the oscillations of the decay lengths are similar to those of freestanding films except for an extra phase shift.
作者
李梦
金洪波
李金铭
孙强
贾瑜
LI Meng;JIN Hong-Bo;LI Jin-Ming;SUN Qiang;JIA Yu(School of Physics and Engineering,Zhengzhou University,Zhengzhou 450052;Department of Physics,Henan Institute of Education,Zhengzhou 450053)
基金
Supported by the National Natural Science Foundation of China under Grant No 10874154.