Disordered hyperuniformity in two-dimensional amorphous silica
| Autor: | Lixin He, Zhen Xiong Shen, Yang Jiao, Wenxiang Xu, Duyu Chen, Ge Zhang, Houlong L. Zhuang, Mohan Chen, Yu Zheng, Lei Liu, Hanqing Nan |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Multidisciplinary
Materials science Condensed matter physics Band gap Physics Materials Science SciAdv r-articles 02 engineering and technology Electron 021001 nanoscience & nanotechnology 01 natural sciences Topological defect Transmission electron microscopy 0103 physical sciences State of matter Density functional theory Amorphous silica 010306 general physics 0210 nano-technology Quantum Research Articles Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Two-dimensional amorphous silica exhibits a novel state of matter, disordered hyperuniformity, and enhanced electronic transport. Disordered hyperuniformity (DHU) is a recently proposed new state of matter, which has been observed in a variety of classical and quantum many-body systems. DHU systems are characterized by vanishing infinite-wavelength normalized density fluctuations and are endowed with unique novel physical properties. Here, we report the discovery of disordered hyperuniformity in atomic-scale two-dimensional materials, i.e., amorphous silica composed of a single layer of atoms, based on spectral-density analysis of high-resolution transmission electron microscopy images. Moreover, we show via large-scale density functional theory calculations that DHU leads to almost complete closure of the electronic bandgap compared to the crystalline counterpart, making the material effectively a metal. This is in contrast to the conventional wisdom that disorder generally diminishes electronic transport and is due to the unique electron wave localization induced by the topological defects in the DHU state. |
| Databáze: | OpenAIRE |
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