Two-dimensional universal conductance fluctuations and the electron-phonon interaction of surface states in Bi2Te2Se microflakes.
Two-dimensional universal conductance fluctuations and the electron-phonon interaction of surface states in Bi2Te2Se microflakes.
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Bi2Te2Se微片中二维普适电导涨落和表面态电子-声子相互作用
DOI：
10.1038/srep00595
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发表时间：
2012
影响因子：
4.6
通讯作者：
Wang, Guanghou
中科院分区：
文献类型：
--
作者：
Li, Zhaoguo;Chen, Taishi;Pan, Haiyang;Song, Fengqi;Wang, Baigeng;Han, Junhao;Qin, Yuyuan;Wang, Xuefeng;Zhang, Rong;Wan, Jianguo;Xing, Dingyu;Wang, Guanghou
普适电导涨落（UCF）是介观电子干涉的重要表现形式之一，但拓扑绝缘体（TI）二维表面态的普适电导涨落尚未得到证实。即使通过改善TI晶体的质量来精细地抑制体电导，体电导的波动仍然保持竞争性并且难以与表面载流子的期望UCF分离。在这里，我们报告的实验证据的二维表面状态的UCFs的大块绝缘Bi 2 Te 2Se微片。实现了纯B超依赖的UCF，并研究了其温度依赖性。弱反定域作用进一步揭示了表面输运。这种表面态的残存UCF是由于三元晶体中体载流子有限的退相长度造成的。电子-声子相互作用被解决作为一个次要来源的表面态退相的基础上的温度依赖的标度行为。
The universal conductance fluctuations (UCFs), one of the most important manifestations of mesoscopic electronic interference, have not yet been demonstrated for the two-dimensional surface state of topological insulators (TIs). Even if one delicately suppresses the bulk conductance by improving the quality of TI crystals, the fluctuation of the bulk conductance still keeps competitive and difficult to be separated from the desired UCFs of surface carriers. Here we report on the experimental evidence of the UCFs of the two-dimensional surface state in the bulk insulating Bi2Te2Se microflakes. The solely-B⊥-dependent UCF is achieved and its temperature dependence is investigated. The surface transport is further revealed by weak antilocalizations. Such survived UCFs of the surface states result from the limited dephasing length of the bulk carriers in ternary crystals. The electron-phonon interaction is addressed as a secondary source of the surface state dephasing based on the temperature-dependent scaling behavior.
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