Angle-resolved photoemission study for double Ag nano®lm structures

We have carried out an angle-resolved photoemission study for Ag/Cu/Ag/Cu(1 1 1) system in order to investigate the electronic coupling between the two quantum-well (QW) states in the double Ag nano®lm structures. It is found that the outer nano®lm thickness dependence of QW state in double Ag nano®lm structures can be explained as the electronic coupling through the thin Cu barrier layer between the QW states in the inner and outer Ag nano®lms. It is also found that the coupling strength depends on the Cu barrier thickness. From these results, we discuss the electronic coupling between the two QW states in the double Ag nano®lm structures. # 2001 Elsevier Science B.V. All rights reserved.