Disordered Hyperuniformity in Two-Dimensional Materials
Автор: MuST Program for Disordered Materials
Загружено: 2022-10-11
Просмотров: 489
Описание: 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. In this talk, we discuss the discovery of disordered hyperuniformity in atomic-scale two-dimensional (2D) materials including amorphous silica and graphene composed of a single layer of atoms, based on spectral-density analysis of high-resolution transmission electron microscopy images. We show via large-scale density functional theory calculations that DHU leads to unexpected electronic structures such as almost complete closure of the electronic bandgap in silica compared to the crystalline counterpart, making the material effectively a metal. Finally, we demonstrate how the Stone–Wales topological defects preserve hyperuniformity and capture the salient feature of disorder in 2D amorphous materials.
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