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Title: Layer-dependent topological phase in a two-dimensional quasicrystal and approximant

Abstract

The electronic and topological properties of materials are derived from the interplay between crystalline symmetry and dimensionality. Simultaneously introducing “forbidden” symmetries via quasiperiodic ordering with low dimensionality into a material system promises the emergence of new physical phenomena. Here, we isolate a two-dimensional (2D) chalcogenide quasicrystal and approximant, and investigate their electronic and topological properties. The 2D layers of the materials with a composition close to Ta 1.6 Te, derived from a layered transition metal dichalcogenide, are isolated with standard exfoliation techniques, and investigated with electron diffraction and atomic resolution scanning transmission electron microscopy. Density functional theory calculations and symmetry analysis of the large unit cell crystalline approximant of the quasicrystal, Ta 21 Te 13 , reveal the presence of symmetry-protected nodal crossings in the quasicrystalline and approximant phases, whose presence is tunable by layer number. Our study provides a platform for the exploration of physics in quasicrystalline, low-dimensional materials and the interconnected nature of topology, dimensionality, and symmetry in electronic systems.

Authors:
; ORCiD logo; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1670472
Grant/Contract Number:  
AC02-05-CH11231
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 117 Journal Issue: 42; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Cain, Jeffrey D., Azizi, Amin, Conrad, Matthias, Griffin, Sinéad M., and Zettl, Alex. Layer-dependent topological phase in a two-dimensional quasicrystal and approximant. United States: N. p., 2020. Web. doi:10.1073/pnas.2015164117.
Cain, Jeffrey D., Azizi, Amin, Conrad, Matthias, Griffin, Sinéad M., & Zettl, Alex. Layer-dependent topological phase in a two-dimensional quasicrystal and approximant. United States. doi:10.1073/pnas.2015164117.
Cain, Jeffrey D., Azizi, Amin, Conrad, Matthias, Griffin, Sinéad M., and Zettl, Alex. Mon . "Layer-dependent topological phase in a two-dimensional quasicrystal and approximant". United States. doi:10.1073/pnas.2015164117.
@article{osti_1670472,
title = {Layer-dependent topological phase in a two-dimensional quasicrystal and approximant},
author = {Cain, Jeffrey D. and Azizi, Amin and Conrad, Matthias and Griffin, Sinéad M. and Zettl, Alex},
abstractNote = {The electronic and topological properties of materials are derived from the interplay between crystalline symmetry and dimensionality. Simultaneously introducing “forbidden” symmetries via quasiperiodic ordering with low dimensionality into a material system promises the emergence of new physical phenomena. Here, we isolate a two-dimensional (2D) chalcogenide quasicrystal and approximant, and investigate their electronic and topological properties. The 2D layers of the materials with a composition close to Ta 1.6 Te, derived from a layered transition metal dichalcogenide, are isolated with standard exfoliation techniques, and investigated with electron diffraction and atomic resolution scanning transmission electron microscopy. Density functional theory calculations and symmetry analysis of the large unit cell crystalline approximant of the quasicrystal, Ta 21 Te 13 , reveal the presence of symmetry-protected nodal crossings in the quasicrystalline and approximant phases, whose presence is tunable by layer number. Our study provides a platform for the exploration of physics in quasicrystalline, low-dimensional materials and the interconnected nature of topology, dimensionality, and symmetry in electronic systems.},
doi = {10.1073/pnas.2015164117},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 42,
volume = 117,
place = {United States},
year = {2020},
month = {10}
}

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