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准一维α-Bi4I4场效应晶体管中栅极可调的输运

成果介绍

Bi4I4属于一个新的准一维(1D)拓扑绝缘体(TI)家族。虽然其β相被证明是典型的弱TI，但长期以来被认为是微不足道绝缘体的α相最近被预测为罕见的高阶TI。

有鉴于此，近日，美国俄亥俄州立大学Chun Ning Lau，德克萨斯大学达拉斯分校Bing Lv和Fan Zhang，莱斯大学Ming Yi以及加州大学伯克利分校Robert J. Birgeneau（共同通讯作者）等合作报道了在剥离的α-Bi4I4场效应晶体管中第一个栅极可调输运以及非常规带拓扑的证据。本文观察到类狄拉克的纵向电阻峰值和霍尔电阻符号变化，它们的温度依赖性表明了相互竞争的输运机制：空穴掺杂的绝缘体和一个或多个栅极可调的双极性边界沟道。组合输运、光电发射和理论结果表明，栅极可调的沟道可能来自新颖的带隙侧表面状态、最底层二维(2D)TI和/或上层的螺旋铰链状态。值得注意的是，在α-Bi4I4约瑟夫森结中观察到栅极可调的超电流，强调了这些边界沟道介导拓扑超导性的潜力。

图文导读

图1. 块材Bi4I4晶体的能带结构和表征。

图2. 器件D1的磁输运数据。

图3. 器件D2温度相关的数据。

图4. 输运和ARPES数据，不包括a-b平面上的表面态。

图5. Bi4I4约瑟夫森结中的超电流。

文献信息

Gate-Tunable Transport in Quasi-One-Dimensional α-Bi4I4 Field Effect Transistors

(Nano Lett., 2022, DOI:10.1021/acs.nanolett.1c04264)

文献链接：网页链接

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Thus in the city>

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黃劍博采风追影金学和红学研究中英文赏析系列第239, 皇氏古建筑大全之第三十五回：西门庆为男宠报仇，书童儿作女妆媚客。

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作文题目 最近，你校同学正在参加某英文报组织的一场讨论。讨论的主题是：公园要不要收门票?请你根据下表所提供的信息，给报社写一封信，客观地介绍讨论情况。

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高考满分作文4

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