Body-centered tetragonal C4: A carbon allotrope with real topology and second-order bulk-boundary correspondence

IF 2.9 3区物理与天体物理 Q3 NANOSCIENCE & NANOTECHNOLOGY

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-08-13 DOI:10.1016/j.physe.2024.116070

Yang Li

引用次数: 0

Abstract

Carbon, being the most common element on Earth, exhibits a diverse range of allotropic phases, hence contributing to its intricate physical characteristics. In recent times, a number of carbon allotropes near the Fermi surfaces have been predicted from first principles with rich topological phases. In this study, we present body-centered tetragonal C₄ (bct C₄), a new form of crystalline sp³ carbon, is a potential candidate for both an obstructed atomic insulator (OAI) and a real Chern insulator (RCI). It is noteworthy that bct C₄ demonstrates an unconventional bulk-boundary correspondence due to its manifestation of hinges boundary states. Our current work reveals that bct C₄ is a viable carbon phase platform for investigating the real topology and second-order bulk-boundary correspondence. It is hoped that our work can serve as a good starting point for future studies on three-dimensional (3D) real Chern insulators.

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体心四方 C4：具有真实拓扑结构和二阶体界对应性的碳同素异形体

碳作为地球上最常见的元素，呈现出多种多样的同素异形相，从而造就了其错综复杂的物理特性。近来，人们根据第一性原理预测了费米面附近的一些碳同素异形体，它们具有丰富的拓扑相。在这项研究中，我们提出了体心四方 C4（bct C4）这一新形式的 sp3 碳晶体，它是受阻原子绝缘体（OAI）和真实切尔绝缘体（RCI）的潜在候选者。值得注意的是，bct C4 由于表现出铰链边界态而显示出非常规的体界对应关系。我们目前的工作表明，bct C4 是研究真实拓扑和二阶体界对应关系的可行碳相平台。希望我们的工作能成为未来研究三维（3D）实哲绝缘体的良好起点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica E-low-dimensional Systems & Nanostructures 物理-纳米科技

CiteScore

7.30

自引率

6.10%

发文量

356

审稿时长

65 days

期刊介绍： Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals. Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena. Keywords: • topological insulators/superconductors, majorana fermions, Wyel semimetals; • quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems; • layered superconductivity, low dimensional systems with superconducting proximity effect; • 2D materials such as transition metal dichalcogenides; • oxide heterostructures including ZnO, SrTiO3 etc; • carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.) • quantum wells and superlattices; • quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect; • optical- and phonons-related phenomena; • magnetic-semiconductor structures; • charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling; • ultra-fast nonlinear optical phenomena; • novel devices and applications (such as high performance sensor, solar cell, etc); • novel growth and fabrication techniques for nanostructures