Bilayer oscillation of subband effective masses in Pb/Ge(111) thin-film quantum wells

Tang, S.-J.; Chang-Yeh Lee; Chien-Chung Huang; Tay-Rong Chang; Cheng-Maw Cheng; Ku-Ding Tsuei; Jeng, H.-T.
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p103106
Academic Journal
Subband dispersions of quantum-well states in Pb thin films on Ge(111) have been measured with angle-resolved photoemission spectroscopy. The effective masses at the surface zone center exhibit a bilayer oscillation with thickness, in both magnitude and sign. This behavior is attributed to a strong interaction between Pb quantum-well subbands and the Ge valence maximum near the Fermi level, which occurs about every two monolayers.


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