Giant c-axis nonlinear anomalous Hall effect in T(d)-MoTe(2) and WTe(2).

Giant c-axis nonlinear anomalous Hall effect in T(d)-MoTe(2) and WTe(2).
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T-d-MoTe2 和 WTe2 中的巨大 c 轴非线性反常霍尔效应

DOI:
10.1038/s41467-021-22343-5
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发表时间:
2021-04-06
影响因子:
16.6
通讯作者:
Tsen AW
Tsen AW
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tiwari A;Chen F;Zhong S;Drueke E;Koo J;Kaczmarek A;Xiao C;Gao J;Luo X;Niu Q;Sun Y;Yan B;Zhao L;Tsen AW

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虽然即使没有外部磁场也可以表现出异常霍尔效应,但时间反转对称性仍然被样品的内部磁化破坏。最近,已经表明,某些没有反转中心的材料允许非线性类型的异常霍尔效应,同时保持时间反演对称性。这种效应可能是由于Berry曲率或通过各种非对称散射机制产生的。在这里,我们报告了在没有内禀磁序的MoTe 2和WTe 2的非中心对称Td相中观察到极大的c轴非线性异常霍尔效应。我们发现,该效果是由倾斜散射在较高的温度下结合另一个散射过程中,在低温下活跃为主。应用更高的偏置会产生极大的霍尔比E/E|| = 2.47,相应的反常霍尔电导率为8 × 107 S/m。某些没有反转对称性的材料可以允许具有守恒时间反转对称性的非线性异常霍尔效应。在这里,作者报告了一个非常大的c轴非线性异常霍尔效应在非中心对称的Td相的MoTe 2和WTe 2没有内在的磁秩序,是由外在散射为主。
While the anomalous Hall effect can manifest even without an external magnetic field, time reversal symmetry is nonetheless still broken by the internal magnetization of the sample. Recently, it has been shown that certain materials without an inversion center allow for a nonlinear type of anomalous Hall effect whilst retaining time reversal symmetry. The effect may arise from either Berry curvature or through various asymmetric scattering mechanisms. Here, we report the observation of an extremely large c-axis nonlinear anomalous Hall effect in the non-centrosymmetric Td phase of MoTe2 and WTe2 without intrinsic magnetic order. We find that the effect is dominated by skew-scattering at higher temperatures combined with another scattering process active at low temperatures. Application of higher bias yields an extremely large Hall ratio of E⊥/E|| = 2.47 and corresponding anomalous Hall conductivity of order 8 × 107 S/m. Certain materials without inversion symmetry may allow for a nonlinear anomalous Hall effect with conserved time reversal symmetry. Here, the authors report an extremely large c-axis nonlinear anomalous Hall effect in the non-centrosymmetric Td phase of MoTe2 and WTe2 without intrinsic magnetic order that is dominated by extrinsic scattering.
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