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<p>We report the electronic structure of the thermoelectric semimetal Ta<sub>2</sub>PdSe<sub>6</sub> with a large thermoelectric power factor and giant Peltier conductivity by means of angle-resolved photoemission spectroscopy (ARPES). The ARPES spectra reveal the coexistence of a sharp hole band with a light electron mass and a broad electron band with a relatively heavy electron mass, which originate from different quasi-one-dimensional (Q1D) chains in Ta<sub>2</sub>PdSe<sub>6</sub>. Moreover, the electron band around the Brillouin-zone (BZ) boundary shows a replica structure with respect to the energy originating from plasmonic polarons due to electron-plasmon interactions. The different scattering effects and interactions in each atomic chain lead to asymmetric transport lifetimes of carriers: a large Seebeck coefficient can be realized even in a semimetal. Our findings pave the way for exploring the thermoelectric materials in previously overlooked semimetals and provide a new platform for low-temperature thermoelectric physics, which has been challenging with semiconductors.</p>

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Band-selective plasmonic polaron in thermoelectric semimetal Ta2PdSe6 with ultra-high power factor

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月5日

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  • Daiki Ootsuki,
  • Akitoshi Nakano,
  • Urara Maruoka,
  • Takumi Hasegawa,
  • Masashi Arita,
  • Miho Kitamura,
  • Koji Horiba,
  • Teppei Yoshida,
  • Ichiro Terasaki

摘要

We report the electronic structure of the thermoelectric semimetal Ta2PdSe6 with a large thermoelectric power factor and giant Peltier conductivity by means of angle-resolved photoemission spectroscopy (ARPES). The ARPES spectra reveal the coexistence of a sharp hole band with a light electron mass and a broad electron band with a relatively heavy electron mass, which originate from different quasi-one-dimensional (Q1D) chains in Ta2PdSe6. Moreover, the electron band around the Brillouin-zone (BZ) boundary shows a replica structure with respect to the energy originating from plasmonic polarons due to electron-plasmon interactions. The different scattering effects and interactions in each atomic chain lead to asymmetric transport lifetimes of carriers: a large Seebeck coefficient can be realized even in a semimetal. Our findings pave the way for exploring the thermoelectric materials in previously overlooked semimetals and provide a new platform for low-temperature thermoelectric physics, which has been challenging with semiconductors.