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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.93: Poster

Dienstag, 23. März 2010, 18:30–21:00, Poster B1

Splitting of quantum well states in Pb films induced by spin dependent confinement — •yingshuang fu, germar hoffmann, and roland wiesendanger — Institute of Applied Physics, University of Hamburg

The electronic structure of Pb(111) quantum films epitaxially grown on Fe/W(110) substrate is investigated with a cryogenic scanning tunnelling microscope. Spin averaged scanning tunnelling spectroscopy (STS) measurements show that quantum well states are formed inside the nanometre thick Pb films. Interestingly, quantum well states (QWSs) of Pb films split into double peaks, and the splitting energy can be tuned by changing the quantum number of QWS and thickness of quantum films. The splitting is explained by spin dependent quantum confinement from the magnetic substrate which shifts the binding energy of supported QWSs and effectively removes their spin degeneracy. Thus, the Pb layer inherits the exchange splitting of the magnetic substrate and could provide spin-polarized two dimensional electron gases for both spin directions. Further investigations with spin resolved STS are underway to confirm the spin splitting of QWSs.