Unusually large chemical potential shift in a degenerate semiconductor: Angle-resolved photoemission study of SnSe and Na-doped SnSe

M. Maeda, K. Yamamoto, T. Mizokawa, N. L. Saini, M. Arita, H. Namatame, M. Taniguchi, G. Tan, L. D. Zhao, M. G. Kanatzidis

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Abstract

We have studied the electronic structure of SnSe and Na-doped SnSe by means of angle-resolved photoemission spectroscopy. The valence-band top reaches the Fermi level by the Na doping, indicating that Na-doped SnSe can be viewed as a degenerate semiconductor. However, in the Na-doped system, the chemical potential shift with temperature is unexpectedly large and is apparently inconsistent with the degenerate semiconductor picture. The large chemical potential shift and anomalous spectral shape are key ingredients for an understanding of the novel metallic state with the large thermoelectric performance in Na-doped SnSe.

Original languageEnglish
Article number121110
JournalPhysical Review B
Volume97
Issue number12
DOIs
Publication statusPublished - 2018 Mar 23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Maeda, M., Yamamoto, K., Mizokawa, T., Saini, N. L., Arita, M., Namatame, H., Taniguchi, M., Tan, G., Zhao, L. D., & Kanatzidis, M. G. (2018). Unusually large chemical potential shift in a degenerate semiconductor: Angle-resolved photoemission study of SnSe and Na-doped SnSe. Physical Review B, 97(12), [121110]. https://doi.org/10.1103/PhysRevB.97.121110