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

Fei Han; Nina Andrejevic; Thanh Nguyen; Vladyslav Kozii; Quynh T. Nguyen; Tom Hogan; Zhiwei Ding; Ricardo Pablo-Pedro; Shreya Parjan; Brian Skinner; Ahmet Alatas; Ercan Alp; Songxue Chi; Jaime Fernandez-Baca; Shengxi Huang; Liang Fu; Mingda Li

doi:10.1038/s41467-020-19850-2

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

Fei Han, Nina Andrejevic, Thanh Nguyen, Vladyslav Kozii, Quynh T. Nguyen, Tom Hogan, Zhiwei Ding, Ricardo Pablo-Pedro, Shreya Parjan, Brian Skinner, Ahmet Alatas, Ercan Alp, Songxue Chi, Jaime Fernandez-Baca, Shengxi Huang, Liang Fu, Mingda Li

Electrical Engineering

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

54 Scopus citations

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 Sxx~1.1×103μVK−1 and giant power factor ~525μWcm−1K−2 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.

Original language	English (US)
Article number	6167
Journal	Nature communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-020-19850-2
State	Published - Dec 2020

All Science Journal Classification (ASJC) codes

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

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10.1038/s41467-020-19850-2

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Han, F., Andrejevic, N., Nguyen, T., Kozii, V., Nguyen, Q. T., Hogan, T., Ding, Z., Pablo-Pedro, R., Parjan, S., Skinner, B., Alatas, A., Alp, E., Chi, S., Fernandez-Baca, J., Huang, S., Fu, L., & Li, M. (2020). Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal. Nature communications, 11(1), Article 6167. https://doi.org/10.1038/s41467-020-19850-2

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title = "Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal",

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 Sxx~1.1×103μVK−1 and giant power factor ~525μWcm−1K−2 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.",

author = "Fei Han and Nina Andrejevic and Thanh Nguyen and Vladyslav Kozii and Nguyen, {Quynh T.} and Tom Hogan and Zhiwei Ding and Ricardo Pablo-Pedro and Shreya Parjan and Brian Skinner and Ahmet Alatas and Ercan Alp and Songxue Chi and Jaime Fernandez-Baca and Shengxi Huang and Liang Fu and Mingda Li",

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Han, F, Andrejevic, N, Nguyen, T, Kozii, V, Nguyen, QT, Hogan, T, Ding, Z, Pablo-Pedro, R, Parjan, S, Skinner, B, Alatas, A, Alp, E, Chi, S, Fernandez-Baca, J, Huang, S, Fu, L & Li, M 2020, 'Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal', Nature communications, vol. 11, no. 1, 6167. https://doi.org/10.1038/s41467-020-19850-2

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AU - Han, Fei

AU - Andrejevic, Nina

AU - Nguyen, Thanh

AU - Kozii, Vladyslav

AU - Nguyen, Quynh T.

AU - Hogan, Tom

AU - Ding, Zhiwei

AU - Pablo-Pedro, Ricardo

AU - Parjan, Shreya

AU - Skinner, Brian

AU - Alatas, Ahmet

AU - Alp, Ercan

AU - Chi, Songxue

AU - Fernandez-Baca, Jaime

AU - Huang, Shengxi

AU - Fu, Liang

AU - Li, Mingda

PY - 2020/12

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N2 - 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 Sxx~1.1×103μVK−1 and giant power factor ~525μWcm−1K−2 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.

AB - 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 Sxx~1.1×103μVK−1 and giant power factor ~525μWcm−1K−2 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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Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal

Abstract

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