Topological semimetal phases in HgTe-related alloys: Berryology and surface transport

HgTe 相关合金中的拓扑半金属相：浆果学和表面传输

• 批准号: 237597403
• 负责人: Professor Dr. Arthur Ernst
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/237597403?language=en
• 关键词: Topological; semimetal; phases; HgTe; related

Topological nontrivial semimetals - Dirac and Weyl semimetals - show intruiging properties: point-like Fermi surfaces in the bulk and at the surface arc-shaped open Fermi surfaces in the case of Weyl semimetals. Motivated by our prediction that - besides the established trivial and strong topological insulator phases of HgTe and HgS - HgTe1-xSx substitutional alloys show topological Dirac semimetal and Weyl semimetal phases upon strain along the [001] direction we will explore the unchartered territory of topological semimetals further:Do other materials similar to HgTe and HgS exhibit topological nontrivial semimetal phases?How can topological nontrivial disordered systems, in particular substitutional alloys, be topologically characterized?How do topological semimetal phases manifest themselves in surface-sensitive transport? What are specific signatures of the unique surface electronic structures of Weyl semimetals, i.e. the Fermi arcs?Furthermore, we will continue our work on magnetically modified topological insulators, to identify systems that exhibit a quantum anomalous Hall effect.

拓扑非平凡的半金属-狄拉克和外尔半金属-显示intruiging性质：点状费米表面的情况下，外尔半金属在体和表面的弧形开放费米表面。我们的预测，除了建立平凡和强大的拓扑绝缘相的碲化汞和HgS -碲化汞1-xSx替代合金显示拓扑狄拉克半金属和Weyl半金属相应变沿着[001]方向，我们将探索未知领域的拓扑半金属进一步：做其他材料类似的碲化汞和HgS表现出拓扑非平凡的半金属相？拓扑非平凡无序系统，特别是置换合金，如何被拓扑表征？拓扑半金属相如何在表面敏感输运中表现出来？外尔半金属独特的表面电子结构，即费米弧的具体特征是什么？此外，我们将继续我们的工作磁改性拓扑绝缘体，以确定系统，表现出量子反常霍尔效应。