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国家自然科学基金(91121003)

作品数:3 被引量:1H指数:1
相关作者:关童滕静吴克辉李永庆更多>>
相关机构:中国科学院更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
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拓扑绝缘体(Bi_(0.5)Sb_(0.5))_2Te_3薄膜中的线性磁阻被引量:1
2015年
本文报道了拓扑绝缘体(Bi0.5Sb0.5)2Te3薄膜中线性磁阻问题的系统性研究工作.此体系中,线性磁阻在很宽的温度和磁场范围内出现:磁场高达18 T时磁阻仍没有饱和趋势,并且当温度不高于50 K时,线性磁阻的大小对温度的变化不敏感.栅压调控化学势可明显改变线性磁阻的大小.当化学势接近狄拉克点时,线性磁阻最为显著.这些结果说明电荷分布的不均匀性是引起该材料线性磁阻的根源.
关童滕静吴克辉李永庆
关键词:拓扑绝缘体
Electrostatic field effects on three-dimensional topological insulators
2013年
Three-dimensional topological insulators are a new class of quantum matter which has interesting connections to nearly all main branches of condensed matter physics. In this article, we briefly review the advances in the field effect control of chemical potential in three-dimensional topological insulators. It is essential to the observation of many exotic quantum phenomena predicted to emerge from the topological insulators and their hybrid structures with other materials. We also describe various methods for probing the surface state transport. Some challenges in experimental study of electron transport in topological insulators will also be briefly discussed.
杨雯敏林朝镜廖剑李永庆
Electron localization in ultrathin films of three-dimensional topological insulators
2016年
The recent discovery of three-dimensional(3D) topological insulators(TIs) has provided a fertile ground for obtaining further insights into electron localization in condensed matter systems.In the past few years,a tremendous amount of research effort has been devoted to investigate electron transport properties of 3D TIs and their low dimensional structures in a wide range of disorder strength,covering transport regimes from weak antilocalization to strong localization.The knowledge gained from these studies not only offers sensitive means to probe the surface states of 3D TIs but also forms a basis for exploring novel topological phases.In this article,we briefly review the main experimental progress in the study of the localization in 3D TIs,with a focus on the latest results on ultrathin TI films.Some new transport data will also be presented in order to complement those reported previously in the literature.
廖剑史刚刘楠李永庆
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