Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DS: Fachverband Dünne Schichten

DS 57: Topological Insulators II
(Joint session of DS and HL, organized by HL)

DS 57.3: Vortrag

Freitag, 11. März 2016, 10:00–10:15, H15

temperature induced shift of the chemical potential of Bi2Te2Se tetradymite topological insulators — •jayita nayak¹, gerhard h fecher¹, siham quardi¹, chandra sekhar¹, claudia felser¹, christian tusche², shigenori ueda³, and eiji ikenaga⁴ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden — ²Max Planck Institute of Microstructure Physics, Halle — ³Synchrotron X-ray Station at SPring-8National Institute for Materials Science, Hyogo 679-5148, Japan — ⁴Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo, 679-5198, Japan

The temperature dependent HAXPES spectra of Bi2Te2Se reveal the appearance of an additional spectral feature above the band gap at low temperature. It appears at 20 K but is absent in the 300 K spectra and the onset of the main features of the spectra is shifted to lower energies. Momentum resolved photoemission electron microscopy (k-PEEM)was carried out using in order to explain the origin of the additional spectral feature. The measurement provides the evidence of the evolution of bulk bands at low temperature which is caused by the shift of the chemical potential. The bulk sensitive HAXPES valence band spectra are in perfect agreement with first principles calculations.