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Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 47: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 47.8: Poster

Tuesday, March 8, 2016, 18:15–20:30, Poster E

Fermi surface mapping of the phase change material Ge2Sb2Te5 by photoelectron spectroscopy — •Jens Kellner1, Marcus Liebmann1, Christian Pauly1, Jos Boschker2, Rui Ning Wang2, Evangelos Golias3, Jaime Sanchez-Barriga3, Oliver Rader3, Raffaella Calarco2, and Markus Morgenstern11II. Physikalisches Institut B, RWTH Aachen — 2Paul Drude Institut für Festkörpelektronik, Berlin — 3Helmholtz-Zentrum, BESSY, Berlin

Phase change materials (PCM) have become essential components of optical memories (DVD-RW, Blu-ray Disc, ...) and they are important candidates for future non-volatile computer memories. Understanding the fundamental electronic properties would thus be important to improve the phase change characteristics. We present an angle-resolved photoemission (ARPES) study of the ternary PCM Ge2Sb2Te5, epitaxially grown on Si(111) in the metastable cubic phase. The sample was transferred in-situ in ultrahigh vacuum from the molecular beam epitaxy system to the analysis chamber, where we performed a three-dimensional mapping of the band structure by variation of the photon energy (15-31 eV). The states close to the Fermi energy, which are contributing to the transport, are used to construct three-dimensional constant energy surfaces mimicking the Fermi surface relevant for the metallic conductivity of the crystalline phase. Additional spin-polarized ARPES measurements identify a surface state close to the Fermi level with a spin polarization of nearly 100%.

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