Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 100: Topological Insulators II
O 100.3: Talk
Friday, March 11, 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.