Topological Phases in Graphene Nanoribbons Tuned by Electric Fields,Physical Review Letters

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Topological Phases in Graphene Nanoribbons Tuned by Electric Fields
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-10-12 , DOI: 10.1103/physrevlett.127.166401
Fangzhou Zhao _{1,

2} , Ting Cao _{1,

2,

3} , Steven G Louie _{1,

2}

Affiliation

Graphene nanoribbons (GNRs) possess distinct symmetry-protected topological phases. We show, through first-principles calculations, that by applying an experimentally accessible transverse electric field, certain boron and nitrogen periodically codoped GNRs have tunable topological phases. The tunability arises from a field-induced band inversion due to an opposite response of the conduction- and valence-band states to the electric field. With a spatially varying applied field, segments of GNRs of distinct topological phases are created, resulting in a field-programmable array of topological junction states, each may be occupied with charge or spin. Our findings not only show that electric field may be used as an easy tuning knob for topological phases in quasi-one-dimensional systems, but also provide new design principles for future GNR-based quantum electronic devices through their topological characters.

中文翻译：

由电场调节的石墨烯纳米带中的拓扑相

石墨烯纳米带（GNR）具有独特的对称保护拓扑相。我们通过第一性原理计算表明，通过应用实验上可访问的横向电场，某些硼和氮周期性共掺杂的 GNR 具有可调的拓扑相。由于导带和价带状态对电场的相反响应，场致能带反转引起了可调谐性。随着空间变化的外加场，不同拓扑相的 GNR 片段被创建，导致拓扑结状态的场可编程阵列，每个可能被电荷或自旋占据。我们的发现不仅表明电场可以用作准一维系统中拓扑相位的简单调谐旋钮，

更新日期：2021-10-12

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