Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 11: Elektronische Struktur (Experiment und Theorie) I

O 11.4: Vortrag

Montag, 8. März 2004, 16:30–16:45, H44

The electronic structure of Pb films on Si(111) — •Ad Ettema1, Anton Mans1, Hugo Dil2, JeongWon Kim2, and Karsten Horn21TUDelft (NL) — 2Fritz Haber Institute, Berlin

The Pb/Si(111) system shows a rich variety of interesting physical properties and phenomena, such as the magic height of islands, vertical Friedel oscillations [1] , a competition between classical and quantum mechanical effects in the shape relaxation [2], anomalous optical absorption [3] and anomalous behaviour in the Hall effect as a function of thickness.

In this contribution we present the results of photoemission experiments carried out at the synchrotron radiation facilities of MAX-lab in Lund (Sweden) and BESSY in Berlin. The results show an anomalously large in-plane effective mass of the 2D quantum well state bands, whereas the original bulk band has a strong dispersion and a free electron behaviour. Moreover, band structure calculations for bulk and thin film slabs predict bands with predominantly free electron character. Our analysis suggests that this phenomenon may be due to a strong electron correlation effect in the 2D bands of the Pb quantum well states.

[1] W.B. Jian, W.B. Su, C.S. Chang and T.T.Tsong, Physical Review Letters 90, 6603 (2003). [2] H Okamoto, D. Chen, T. Yamada , Physical Review Letters 89, 6101 (2002). [3]M Jalochowski et al, Physical Review B 66, 205417 (2002).

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