Large transverse thermoelectric figure of merit in a topological Dirac semimetal

Xiang, Junsen; Hu, Sile; Lyu, Meng; Zhu, Wenliang; Ma, Chaoyang; Chen, Ziyu; Steglich, F.; Chen, Genfu; Sun, Peijie

doi:10.1007/s11433-019-1445-4

Cited by 52 publications

(59 citation statements)

References 36 publications

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“…Consequently, benefit from the greatly enhanced power factor, a maximum zT of ≈0.12 at 300 K is obtained along the ab-plane, about three times higher than that of the c-axis, which is a good value for a novel semimetal single crystal without any purposeful optimization. Further strategies, for example, using multiple phonon scattering to decrease the thermal conductivity, [44] optimizing the carrier concentration by chemical doping, [45] as well as applying magnetic field [46,47] are promising to enhance the thermoelectric performance. Note that Zintl compounds are a big family composed of electropositive cations (typically, groups 1 and 2) and post-transition metal or metalloid (i.e., groups 13-16), varying from strictly defined semiconducting Zintl phase to metallic alloys.…”

Section: (4 Of 8)mentioning

confidence: 99%

“…Further strategies, for example, using multiple phonon scattering to decrease the thermal conductivity, [ 44 ] optimizing the carrier concentration by chemical doping, [ 45 ] as well as applying magnetic field [ 46,47 ] are promising to enhance the thermoelectric performance. Note that Zintl compounds are a big family composed of electropositive cations (typically, groups 1 and 2) and post‐transition metal or metalloid (i.e., groups 13–16), varying from strictly defined semiconducting Zintl phase to metallic alloys.…”

Section: Figurementioning

confidence: 99%

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Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb₂

et al. 2020

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The emerging class of topological materials provides a platform to engineer exotic electronic structures for a variety of applications. As complex band structures and Fermi surfaces can directly benefit thermoelectric performance it is important to identify the role of featured topological bands in thermoelectrics particularly when there are coexisting classic regular bands. In this work, the contribution of Dirac bands to thermoelectric performance and their ability to concurrently achieve large thermopower and low resistivity in novel semimetals is investigated. By examining the YbMnSb2 nodal line semimetal as an example, the Dirac bands appear to provide a low resistivity along the direction in which they are highly dispersive. Moreover, because of the regular‐band‐provided density of states, a large Seebeck coefficient over 160 µV K−1 at 300 K is achieved in both directions, which is very high for a semimetal with high carrier concentration. The combined highly dispersive Dirac and regular bands lead to ten times increase in power factor, reaching a value of 2.1 mW m−1 K−2 at 300 K. The present work highlights the potential of such novel semimetals for unusual electronic transport properties and guides strategies towards high thermoelectric performance.

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Section: (4 Of 8)mentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb₂

et al. 2020

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“…For instance, in the Dirac semimetal Cd 3 As 2 [19], which has ultrahigh carrier mobility [20], anomalous magneto-Seebeck and Nernst effects were recently observed [12,14], and the relationship between these anomalous transport properties with Berry curvature was discussed. Moreover, the magnetic-field-induced giant enhancement in both longitudinal and transverse zT values were found in Cd 3 As 2 single crystals near room temperature [11,21,22]. NbP, one of the first type-I Weyl semimetals to be discovered [23][24][25], has recently attracted attention as a material platform for exploring the Weyl physics-related thermoelectric transport properties.…”

Section: Introductionmentioning

confidence: 99%

Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn ₄

Guin

Scaffidi

et al. 2020

Research

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Highly conductive topological semimetals with exotic electronic structures offer fertile ground for the investigation of the electrical and thermal transport behavior of quasiparticles. Here, we find that the layer-structured Dirac semimetal PtSn4 exhibits a largely suppressed thermal conductivity under a magnetic field. At low temperatures, a dramatic decrease in the thermal conductivity of PtSn4 by more than two orders of magnitude is obtained at 9 T. Moreover, PtSn4 shows both strong longitudinal and transverse thermoelectric responses under a magnetic field. Large power factor and Nernst power factor of approximately 80–100 μW·cm-1·K-2 are obtained around 15 K in various magnetic fields. As a result, the thermoelectric figure of merit zT is strongly enhanced by more than 30 times, compared to that without a magnetic field. This work provides a paradigm for the decoupling of the electron and hole transport behavior of highly conductive topological semimetals and is helpful for developing topological semimetals for thermoelectric energy conversion.

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“…Graphene, a new type of two-dimensional material, has attracted great interest due to its remarkable optical properties, high carrier mobility, and tunable surface conductivity within the terahertz frequency range [ 7 ]. Similarly, the relative permittivity of BDS, a material that can be considered as “3D graphene”, can also be dynamically controlled by an external gate voltage [ 8 , 9 ]. Up to now, some graphene- or Dirac-semimetal-based devices have been reported in the terahertz range [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Dual-Tunable Broadband Terahertz Absorber Based on a Hybrid Graphene-Dirac Semimetal Structure

Yuan

Zhang

et al. 2020

Micromachines

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A dual-controlled tunable broadband terahertz absorber based on a hybrid graphene-Dirac semimetal structure is designed and studied. Owing to the flexible tunability of the surface conductivity of graphene and relative permittivity of Dirac semimetal, the absorption bandwidth can be tuned independently or jointly by shifting the Fermi energy through chemical doping or applying gate voltage. Under normal incidence, the device exhibits a high absorption larger than 90% over a broad range of 4.06–10.7 THz for both TE and TM polarizations. Moreover, the absorber is insensitive to incident angles, yielding a high absorption over 90% at a large incident angle of 60° and 70° for TE and TM modes, respectively. The structure shows great potential in miniaturized ultra-broadband terahertz absorbers and related applications.

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Large transverse thermoelectric figure of merit in a topological Dirac semimetal

Cited by 52 publications

References 36 publications

Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb₂

Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb₂

Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn ₄

Dual-Tunable Broadband Terahertz Absorber Based on a Hybrid Graphene-Dirac Semimetal Structure

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Large transverse thermoelectric figure of merit in a topological Dirac semimetal

Cited by 52 publications

References 36 publications

Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb2

Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb2

Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn 4

Dual-Tunable Broadband Terahertz Absorber Based on a Hybrid Graphene-Dirac Semimetal Structure

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Product

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Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb₂

Thermoelectric Properties of Novel Semimetals: A Case Study of YbMnSb₂

Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn ₄