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Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal.

  • Author(s): Han, Fei;
  • Andrejevic, Nina;
  • Nguyen, Thanh;
  • Kozii, Vladyslav;
  • Nguyen, Quynh T;
  • Hogan, Tom;
  • Ding, Zhiwei;
  • Pablo-Pedro, Ricardo;
  • Parjan, Shreya;
  • Skinner, Brian;
  • Alatas, Ahmet;
  • Alp, Ercan;
  • Chi, Songxue;
  • Fernandez-Baca, Jaime;
  • Huang, Shengxi;
  • Fu, Liang;
  • Li, Mingda
  • et al.
Abstract

Thermoelectrics are promising by directly generating electricity from waste heat. However, (sub-)room-temperature thermoelectrics have been a long-standing challenge due to vanishing electronic entropy at low temperatures. Topological materials offer a new avenue for energy harvesting applications. Recent theories predicted that topological semimetals at the quantum limit can lead to a large, non-saturating thermopower and a quantized thermoelectric Hall conductivity approaching a universal value. Here, we experimentally demonstrate the non-saturating thermopower and quantized thermoelectric Hall effect in the topological Weyl semimetal (WSM) tantalum phosphide (TaP). An ultrahigh longitudinal thermopower [Formula: see text] and giant power factor [Formula: see text] are observed at ~40 K, which is largely attributed to the quantized thermoelectric Hall effect. Our work highlights the unique quantized thermoelectric Hall effect realized in a WSM toward low-temperature energy harvesting applications.

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