Spectroscopic verification of nanometer-spaced modulated structure that T1 compound which is a candidate for a thermoelectric material shows

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Three dimensional(3D) atomic images around the T1 atoms in single crystal T1InSe_2 thermoelectric material in the incommensurate(IC) phase were reconstructed using T1LIII X-ray fluorescence holography. Comparison of the experimentally obtained 3D images with the theoretical calculated ones suggests that the T1 atoms have extremely large spatial fluctuations, which are related to the IC phase of this material, and corresponds well to those proposed by theoretical phonon calculations. Furthermore, we observed a cross-type peculiar dispersive structure for T1GaTe_2 and T1Se by means of angle-resolved photoemission spectroscopy(ARPES). It is assumed that the observed peculiar dispersive structure is caused by the dispersion of high-lying surface conduction bands and that ARPES detects the joint density of states.