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arXiv 1804.02427cond-mat.mes-hallcond-mat.mtrl-sci
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超高质量少层黑磷晶体管中的量子和分数量子霍尔效应

Integer and Fractional Quantum Hall effect in Ultra-high Quality Few-layer Black Phosphorus Transistors

Jiawei Yang, Son Tran, Jason Wu, Shi Che, Petr Stepanov, Takashi Taniguchi, Kenji Watanabe, Hongwoo Baek, Dmitry Smirnov, Ruoyu Chen, Chun Ning Lau

摘要:

作为一种高迁移率的二维半导体材料,原子薄的黑磷(BP)具有很强的结构和电子各向异性,为研究量子霍尔(QH)效应提供了一个新的平台,其中包括朗道能级(LL)能隙对磁场B的函数依赖性以及可能的各向异性分数QH态等突出问题。使用迁移率高达55,000 cm 2/Vs的封装少层BP晶体管,我们在填充因子ν=-1到-4的QH态的非常宽的B范围内提取LL带隙,这被确定为在B中是线性的,从而解决了由其各向异性引起的争议。此外,在ν~ -4/3处观察到分数QH态和在-0.56+/-0.1处的附加特征,强调BP作为探索电子相互作用的可调谐2D平台。

英文摘要:

As a high mobility two-dimensional semiconductor with strong structural and electronic anisotropy, atomically thin black phosphorus (BP) provides a new playground for investigating the quantum Hall (QH) effect, including outstanding questions such as the functional dependence of Landau level (LL) gaps on magnetic field B, and possible anisotropic fractional QH states. Using encapsulating few-layer BP transistors with mobility up to 55,000 cm2/Vs, we extract LL gaps over an exceptionally wide range of B for QH states at filling factors ν=-1 to -4, which are determined to be linear in B, thus resolving a controversy raised by its anisotropy. Furthermore, a fractional QH state at ν~ -4/3 and an additional feature at -0.56+/- 0.1 are observed, underscoring BP as a tunable 2D platform for exploring electron interactions.

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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