论文标题
Quasi One维weyl semimetal（tase $ _4 $）$ _ 2 $ i
Magnetoresistance in quasi-one dimensional Weyl semimetal (TaSe$_4$)$_2$I
论文作者
论文摘要
对线性和非线性电导率的磁场效应，对具有电荷密度波（CDW）（Tase $ _4 $）$ _ 2 $ i的准二维Weyl半学（CDW）效果进行了研究。在所有已知的CDW运动方案（线性传导，蠕变，滑动，“Fröhlich超导性”）中，纵向磁倍率很小，正面且不超过百分之一的比例。在通过聚焦离子束构造的样品中进行了类似的磁转运测量，从而使CDW运动的运动伴随CDW的相位滑动。在这样的样品中，在相对较小的磁场中观察到峰值的非促谁透蛋白的负磁磁性，在纵向和横向几何形状的非线性传导状态下，$ b \ sellssim 4 $ t。我们的结果与较早获得的结果显着不同，并提出了有关观察PEIERLS状态中Weyl半学中轴突异常的问题。
Magnetic field effect on linear and nonlinear conductivity in a quasi-one-dimensional Weyl semimetal with a charge density wave (CDW) (TaSe$_4$)$_2$I is studied. Longitudinal magnetoresistance in all known regimes of CDW motion (linear conduction, creep, sliding, "Fröhlich superconductivity") is small, positive and do not exceed a fraction of per cent. Similar magnetotransport measurements were performed in samples profiled by focused ion beams is such a way that motion of the CDW in them is accompanied by phase slip of the CDW. In such samples, a peak-like non-parabolic negative magnetoresistance is observed in relatively small magnetic fields $B \lesssim 4$ T in the nonlinear conduction regime in both longitudinal and transverse geometries. Our results differ significantly from ones obtained earlier and raise the question concerning conditions for observing the axion anomaly in Weyl semimetals in the Peierls state.
