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arXiv 2003.11731cond-mat.mes-hallcond-mat.mtrl-sci
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具有磁邻近效应的一维沟道中的巨栅控奇宇称磁电阻效应

Giant gate-controlled odd-parity magnetoresistance in one-dimensional channels with a magnetic proximity effect

Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba, Ryota Fukuzawa, Takuji Takahashi, Masaaki Tanaka

摘要:

根据Onsager原理,一般导体的电阻$R$表现为外部磁场$B$的偶函数。只有在特殊的情况下,即时间反演对称性(TRS)被铁磁性破缺的情况下,才能观察到$R$对$B$的奇分量。这种不寻常的现象,称为奇宇称磁阻(OMR),迄今为止是微妙的(< 2%),难以控制的外部手段。在这里,我们报告了一个巨大的OMR高达27%的边缘传输通道的InAs量子阱,这是磁化的邻近效应从下面的铁磁半导体(Ga,Fe)Sb层。结合实验结果和理论分析,使用线性化玻尔兹曼方程,我们发现,同时打破的TRS的磁邻近效应(MPE)和空间反演对称性(SIS)在一维(1D)的InAs边缘通道是这个巨大的OMR的起源。我们还展示了在边缘通道中使用TRS或SIS的电门控来打开和关闭OMR的能力。这些发现提供了一个深刻的洞察一维半导体系统具有强磁耦合。

英文摘要:

According to Onsager's principle, electrical resistance $R$ of general conductors behaves as an even function of external magnetic field $B$. Only in special circumstances, which involve time reversal symmetry (TRS) broken by ferromagnetism, the odd component of $R$ against $B$ is observed. This unusual phenomenon, called odd-parity magnetoresistance (OMR), was hitherto subtle (< 2%) and hard to control by external means. Here, we report a giant OMR as large as 27% in edge transport channels of an InAs quantum well, which is magnetized by a proximity effect from an underlying ferromagnetic semiconductor (Ga,Fe)Sb layer. Combining experimental results and theoretical analysis using the linearized Boltzmann's equation, we found that simultaneous breaking of both the TRS by the magnetic proximity effect (MPE) and spatial inversion symmetry (SIS) in the one-dimensional (1D) InAs edge channels is the origin of this giant OMR. We also demonstrated the ability to turn on and off the OMR using electrical gating of either TRS or SIS in the edge channels. These findings provide a deep insight into the 1D semiconducting system with a strong magnetic coupling.

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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