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arXiv 1502.06266cond-mat.str-elcond-mat.mes-hall
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Dirac半金属Na_3Bi的反常电导张量

Anomalous conductivity tensor in the Dirac semimetal Na_3Bi

Jun Xiong, Satya Kushwaha, Jason Krizan, Tian Liang, R. J. Cava, N. P. Ong

摘要:

Na 3Bi是一种狄拉克半金属,具有受保护的节点,可能对磁场B中的时间反演不变性的破坏敏感。我们报告的实验表明,电导率和电阻率张量表现出强大的异常在B。电阻率$ρ_{xx}$是B-线性高达35 T,而霍尔角表现出一个不寻常的轮廓接近阶梯函数。电导率$σ_{xx}$和$σ_{xy}$在大B下具有相同的幂律依赖性。我们提出,这些显着偏离传统的运输结果从一个不寻常的敏感性的运输寿命B。并与Cd_3As_2作了比较。

英文摘要:

Na3Bi is a Dirac semimetal with protected nodes that may be sensitive to the breaking of time-reversal invariance in a magnetic field B. We report experiments which reveal that both the conductivity and resistivity tensors exhibit robust anomalies in B. The resistivity $ρ_{xx}$ is B-linear up to 35 T, while the Hall angle exhibits an unusual profile approaching a step-function. The conductivities $σ_{xx}$ and $σ_{xy}$ share identical power-law dependences at large B. We propose that these significant deviations from conventional transport result from an unusual sensitivity of the transport lifetime to B. Comparison with Cd3As2 is made.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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