Anomalous surface conductivity of Weyl semimetals
Anomalous surface conductivity of Weyl semimetals
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DOI：
10.1103/physrevb.106.245410
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发表时间：
2021-12
影响因子：
3.7
通讯作者：
H. Pal;Osakpolor Eki Obakpolor;P. Hosur
中科院分区：
文献类型：
--
作者：
H. Pal;Osakpolor Eki Obakpolor;P. Hosur
我们计算外尔半金属的表面直流电导率，并表明它包含一个异常的贡献，除了从费米弧的德鲁德贡献。反常部分是独立的表面散射时间，并出现在非零温度和掺杂（远离外尔节点），增加二次与两者的通用比率的coe centients。微观上，它是由于无隙体对表面电导率的贡献。我们认为，这可以解释为一个有效的相互作用的表面的导电性与费米弧金属共存。在一定的低温范围内，表面电导率的温度依赖性由异常响应主导，这可以通过实验来探索以解开不寻常的行为。
We calculate the surface dc conductivity of Weyl semimetals and show that it contains an anomalous contribution in addition to a Drude contribution from the Fermi arc. The anomalous part is independent of the surface scattering time, and appears at nonzero temperature and doping (away from the Weyl nodes), increasing quadratically with both with a universal ratio of coefficients. Mi-croscopically, it results from the contribution of the gapless bulk to the surface conductivity. We argue that this can be interpreted as the conductivity of an effective interacting surface fluid that coexists with the Fermi arc metal. In a certain regime of low temperatures, the temperature dependence of the surface conductivity is dominated by the anomalous response, which can be probed experimentally to unravel the unusual behavior.