Charge Transport in Weyl Semimetals
Charge Transport in Weyl Semimetals
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DOI：
10.1103/physrevlett.108.046602
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发表时间：
2012-01-24
影响因子：
8.6
通讯作者：
Vishwanath, Ashvin
中科院分区：
文献类型：
--
作者：
Hosur, Pavan;Parameswaran, S. A.;Vishwanath, Ashvin
研究了温度T下存在库仑相互作用或无序时具有N各向同性Weyl节点的Weyl半金属中的输运问题。在相互作用的清洁限制，我们确定的电导率σ（ω，T）通过解决量子玻尔兹曼方程内的“领先的日志”近似，并发现它是成比例的T，对数因子所产生的耦合流。在非相互作用无序的情况下，我们计算Kubo电导率，并表明它的行为不同的ω> T：在前一制度，我们恢复了以前的结果，有限的直流电导率和Drude宽度消失为NT 2;在后者，我们发现，σ（ω，T）随σ线性消失（ω，T），其中前导项为T -> 0，等于干净的自由费米子结果：σ（（N））（0）（ω，T = 0）= Ne（2）/12 h竖线ω竖线/nu（F）。我们比较我们的结果Y2 Ir 2 O 7的运输数据和评论可能的相关性，最近的实验Eu 2 Ir 2 O 7。
We study transport in Weyl semimetals with N isotropic Weyl nodes in the presence of Coulomb interactions or disorder at temperature T. In the interacting clean limit, we determine the conductivity sigma(omega, T) by solving a quantum Boltzmann equation within a "leading log'' approximation and find it to be proportional to T, up to logarithmic factors arising from the flow of couplings. In the noninteracting disordered case, we compute the Kubo conductivity and show that it behaves differently for omega > T: in the former regime we recover a previous result, of a finite dc conductivity and a Drude width vanishing as NT2; in the latter, we find that sigma(omega, T) vanishes linearly with sigma(omega, T) with a leading term as T -> 0 equal to the clean, free-fermion result: sigma((N))(0)(omega, T = 0) = N e(2)/12h vertical bar omega vertical bar/nu(F). We compare our results to transport data on Y2Ir2O7 and comment on the possible relevance to recent experiments on Eu2Ir2O7.