Theory of anomalous magnetotransport from mass anisotropy
Theory of anomalous magnetotransport from mass anisotropy
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质量各向异性的反常磁输运理论
DOI：
10.1103/physrevb.95.245135
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发表时间：
2017
影响因子：
3.7
通讯作者：
T. Senthil
中科院分区：
文献类型：
--
作者：
Liujun Zou;S. Lederer;T. Senthil
在低掺杂YBA$2$Cu3$O${6+x}$中，有证据表明，在掺杂制度$0.12<；p<；0.16$中，有一个小的费米表面口袋受到质量显著增强的影响。由于“热点”或其他相关物理因素，费米表面上的这种质量增强可能会有很大的变化。因此，我们研究了具有大有效质量各向异性的类电子费米口袋的磁输运。在弛豫时间近似下，我们发现，即使对于形状固定的口袋，霍尔效应的大小和符号也可能随着质量各向异性的变化而改变(除了非常大的，可能无法到达的磁场)。我们讨论了高场中近乎最佳掺杂铜酸盐的霍尔测量的意义。此外，我们还发现了一种新的磁场的中间渐近区域，其特征是B线性磁阻。类似的现象应该发生在具有各向异性质量增强的各种其他实验系统中
In underdoped YBa$_2$Cu$_3$O$_{6+x}$, there is evidence of a small Fermi surface pocket subject to substantial mass enhancement in the doping regime $ 0.12<p<0.16$. This mass enhancement may vary substantially over the Fermi surface, due to "hot spot" or other relevant physics. We therefore examine the magnetotransport of an electron-like Fermi pocket with large effective mass anisotropy. Within the relaxation time approximation, we show that even for a pocket with a fixed shape, the magnitude and sign of the Hall effect may change as the mass anisotropy changes (except at very large, likely inaccessible magnetic fields). We discuss implications for recent Hall measurements in near optimally doped cuprates in high fields. In addition we identify a novel intermediate asymptotic regime of magnetic field, characterized by B-linear magnetoresistance. Similar phenomena should occur in a variety of other experimental systems with anisotropic mass enhancement