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Thermoelectric Hall conductivity and figure of merit in Dirac/Weyl materials

机译：Dirac / Weyl材料的热电霍尔电导率和品质因数

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摘要

We calculate the thermoelectric response coefficients of three-dimensional Dirac or Weyl semimetals as a function of magnetic field, temperature, and Fermi energy. We focus in particular on the thermoelectric Hall coefficient alpha(xy) and the Seebeck coefficient S-xx which are well-defined even in the dissipationless limit. We contrast the behaviors of alpha(xy) and S-xx with those of traditional Schrodinger particle systems, such as doped semiconductors. Strikingly, we find that for Dirac materials alpha(xy) acquires a constant, quantized value at sufficiently large magnetic field, which is independent of the magnetic field or the Fermi energy, and this leads to unprecedented growth in the thermopower and the thermoelectric figure of merit. We further show that even relatively small fields, such that omega(c)tau similar to 1(where omega(c) is the cyclotron frequency and t is the scattering time), are sufficient to produce a more than 100% increase in the figure of merit.
机译：我们计算三维Dirac或Weyl半金属的热电响应系数与磁场，温度和费米能的关系。我们特别关注热电霍尔系数alpha（xy）和塞贝克系数S-xx，即使在无耗散极限内也可以很好地定义它们。我们将alpha（xy）和S-xx的行为与传统Schrodinger粒子系统（例如掺杂的半导体）的行为进行了对比。令人惊讶地，我们发现对于狄拉克材料，α（xy）在足够大的磁场下获得恒定的量化值，而与磁场或费米能量无关，这导致热能和热电图的空前增长值得。我们进一步表明，即使相对较小的场（例如，omega（c）tau类似于1（其中omega（c）是回旋加速器频率，t是散射时间））也足以产生图中100％以上的增长功绩。

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  • 来源
    《Physical review》 |2019年第15期|155123.1-155123.9|共9页
  • 作者

    Kozii Vladyslav; Skinner Brian; Fu Liang;

  • 作者单位

    MIT, Dept Phys, Cambridge, MA 02139 USA;

    MIT, Dept Phys, Cambridge, MA 02139 USA;

    MIT, Dept Phys, Cambridge, MA 02139 USA;

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