Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe

Takanobu Nagayama; Kensei Terashima; Takanori Wakita; Hirokazu Fujiwara; Tetsushi Fukura; Yuko Yano; Kanta Ono; Hiroshi Kumigashira; Osamu Ogiso; Aichi Yamashita; Yoshihiko Takano; Hitoshi Mori; Hidetomo Usui; Masayuki Ochi; Kazuhiko Kuroki; Yuji Muraoka; Takayoshi Yokoya

Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe

Takanobu Nagayama, Kensei Terashima, Takanori Wakita, Hirokazu Fujiwara, Tetsushi Fukura, Yuko Yano, Kanta Ono, Hiroshi Kumigashira, Osamu Ogiso, Aichi Yamashita, Yoshihiko Takano, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Kazuhiko Kuroki, Yuji Muraoka, Takayoshi Yokoya

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

Abstract

Synchrotron-based angle-resolved photoemission spectroscopy is used to determine the electronic structure of layered SnSe, which was recently turned out to be a potential thermoelectric material. We observe that the top of the valence band consists of two nearly independent hole bands, whose tops differ by ~20 meV in energy, indicating the necessity of a multivalley model to describe the thermoelectric properties. The estimated effective masses are anisotropic, with in-plane values of 0.16–0.39 m₀ and an out-of-plane value of 0.71 m₀, where m₀ is the rest electron mass. Information of the electronic structure is essential to further enhance the thermoelectric performance of hole-doped SnSe.

Original language	English
Journal	Unknown Journal
Publication status	Published - Dec 26 2017

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Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe. / Nagayama, Takanobu; Terashima, Kensei; Wakita, Takanori; Fujiwara, Hirokazu; Fukura, Tetsushi; Yano, Yuko; Ono, Kanta; Kumigashira, Hiroshi; Ogiso, Osamu; Yamashita, Aichi; Takano, Yoshihiko; Mori, Hitoshi; Usui, Hidetomo; Ochi, Masayuki; Kuroki, Kazuhiko; Muraoka, Yuji ; Yokoya, Takayoshi.

In: Unknown Journal, 26.12.2017.

Research output: Contribution to journal › Article › peer-review

Nagayama, Takanobu ; Terashima, Kensei ; Wakita, Takanori ; Fujiwara, Hirokazu ; Fukura, Tetsushi ; Yano, Yuko ; Ono, Kanta ; Kumigashira, Hiroshi ; Ogiso, Osamu ; Yamashita, Aichi ; Takano, Yoshihiko ; Mori, Hitoshi ; Usui, Hidetomo ; Ochi, Masayuki ; Kuroki, Kazuhiko ; Muraoka, Yuji ; Yokoya, Takayoshi. / Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe. In: Unknown Journal. 2017.

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title = "Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe",

abstract = "Synchrotron-based angle-resolved photoemission spectroscopy is used to determine the electronic structure of layered SnSe, which was recently turned out to be a potential thermoelectric material. We observe that the top of the valence band consists of two nearly independent hole bands, whose tops differ by ~20 meV in energy, indicating the necessity of a multivalley model to describe the thermoelectric properties. The estimated effective masses are anisotropic, with in-plane values of 0.16–0.39 m0 and an out-of-plane value of 0.71 m0, where m0 is the rest electron mass. Information of the electronic structure is essential to further enhance the thermoelectric performance of hole-doped SnSe.",

author = "Takanobu Nagayama and Kensei Terashima and Takanori Wakita and Hirokazu Fujiwara and Tetsushi Fukura and Yuko Yano and Kanta Ono and Hiroshi Kumigashira and Osamu Ogiso and Aichi Yamashita and Yoshihiko Takano and Hitoshi Mori and Hidetomo Usui and Masayuki Ochi and Kazuhiko Kuroki and Yuji Muraoka and Takayoshi Yokoya",

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T1 - Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe

AU - Nagayama, Takanobu

AU - Terashima, Kensei

AU - Wakita, Takanori

AU - Fujiwara, Hirokazu

AU - Fukura, Tetsushi

AU - Yano, Yuko

AU - Ono, Kanta

AU - Kumigashira, Hiroshi

AU - Ogiso, Osamu

AU - Yamashita, Aichi

AU - Takano, Yoshihiko

AU - Mori, Hitoshi

AU - Usui, Hidetomo

AU - Ochi, Masayuki

AU - Kuroki, Kazuhiko

AU - Muraoka, Yuji

AU - Yokoya, Takayoshi

PY - 2017/12/26

Y1 - 2017/12/26

N2 - Synchrotron-based angle-resolved photoemission spectroscopy is used to determine the electronic structure of layered SnSe, which was recently turned out to be a potential thermoelectric material. We observe that the top of the valence band consists of two nearly independent hole bands, whose tops differ by ~20 meV in energy, indicating the necessity of a multivalley model to describe the thermoelectric properties. The estimated effective masses are anisotropic, with in-plane values of 0.16–0.39 m0 and an out-of-plane value of 0.71 m0, where m0 is the rest electron mass. Information of the electronic structure is essential to further enhance the thermoelectric performance of hole-doped SnSe.

AB - Synchrotron-based angle-resolved photoemission spectroscopy is used to determine the electronic structure of layered SnSe, which was recently turned out to be a potential thermoelectric material. We observe that the top of the valence band consists of two nearly independent hole bands, whose tops differ by ~20 meV in energy, indicating the necessity of a multivalley model to describe the thermoelectric properties. The estimated effective masses are anisotropic, with in-plane values of 0.16–0.39 m0 and an out-of-plane value of 0.71 m0, where m0 is the rest electron mass. Information of the electronic structure is essential to further enhance the thermoelectric performance of hole-doped SnSe.

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