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Topological phase transition driven by a spatially periodic potential

机译:空间周期性电势驱动的拓扑相变

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摘要

We propose a simple approach to realize a topological phase transition using a spatial periodic potential. As an example, we examine the electronic structures of HgTe/CdTe quantum wells, and demonstrate that their band structures can be effectively manipulated by the periodic potential. At a critical potential, we find that a conventional band insulator undergoes a topological phase transition into a quantum spin Hall system, which is characterized by an abrupt change of the spin Chern number and emerging edge states. Our proposal provides an interesting way to dynamically turn on or off topologically protected edge states for application in switching devices.
机译:我们提出了一种简单的方法来利用空间周期势来实现拓扑相变。例如,我们检查了HgTe / CdTe量子阱的电子结构,并证明了它们的能带结构可以被周期性势有效地操纵。在临界电势下,我们发现常规的带绝缘子经历了拓扑相变,转变成量子自旋霍尔系统,其特征是自旋Chern数突然变化并出现了边缘状态。我们的建议提供了一种有趣的方式来动态打开或关闭拓扑保护的边缘状态,以用于交换设备中。

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  • 来源
    《Physical review》 |2014年第21期|214502.1-214502.6|共6页
  • 作者单位

    Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China;

    Department of Physics, Duke University, Post Office Box 90305, Durham, North Carolina 27708, USA;

    Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;

    Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;

    Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China,Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum phase transitions; electron density of states and band structure of crystalline solids; electron states at surfaces and interfaces;

    机译:量子相变态固体的电子态密度和能带结构;表面和界面的电子态;

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