Abstract
A double quantum well (QW) system of Cu/Co(1 ML)/Cu grown on Co/Cu(001) has been investigated by photoemission spectroscopy. Energy spectra of the valence band from one of the Cu QW’s have been measured as a function of the other Cu QW thickness. The results show strong resonance between the two Cu QW states across a 1 ML Co barrier. In particular, we observe that quantum well coupling removes the degeneracy of the two Cu QW states, resulting in a state crossing effect. A phase accumulation model is developed to explain these observations.
- Received 2 October 2001
DOI:https://doi.org/10.1103/PhysRevB.65.113406
©2002 American Physical Society
