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Controlling and visualizing Dirac physics in topological semimetal heterostructures
A bulk crystal of cadmium arsenide is a three-dimensional Dirac semimetal, but, in a thin film, it can behave like a three-dimensional topological insulator. This tunability provides unique opportunities to manipulate and explore a topological insulator phase. However, an obstacle to engineering suc...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9269884/ https://www.ncbi.nlm.nih.gov/pubmed/35857456 http://dx.doi.org/10.1126/sciadv.abn4479 |
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author | Kealhofer, David A. Kealhofer, Robert Ohara, Daniel Pardue, Tyler N. Stemmer, Susanne |
author_facet | Kealhofer, David A. Kealhofer, Robert Ohara, Daniel Pardue, Tyler N. Stemmer, Susanne |
author_sort | Kealhofer, David A. |
collection | PubMed |
description | A bulk crystal of cadmium arsenide is a three-dimensional Dirac semimetal, but, in a thin film, it can behave like a three-dimensional topological insulator. This tunability provides unique opportunities to manipulate and explore a topological insulator phase. However, an obstacle to engineering such tunability is the subtlety of transport-based discriminants for topological phases. In this work, the quantum capacitance of cadmium arsenide–based heterostructures provides two direct experimental signatures of three-dimensional topological insulator physics: an insulating three-dimensional bulk and a Landau level at zero energy that does not disperse in a magnetic field. We proceed to join our ability to see these fingerprints of the topological surface states with flexibility afforded by our epitaxial heterostructures to demonstrate a route toward controlling the energy of the Dirac nodes on each surface. These results point to new avenues for engineering topological insulators based on cadmium arsenide. |
format | Online Article Text |
id | pubmed-9269884 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-92698842022-07-20 Controlling and visualizing Dirac physics in topological semimetal heterostructures Kealhofer, David A. Kealhofer, Robert Ohara, Daniel Pardue, Tyler N. Stemmer, Susanne Sci Adv Physical and Materials Sciences A bulk crystal of cadmium arsenide is a three-dimensional Dirac semimetal, but, in a thin film, it can behave like a three-dimensional topological insulator. This tunability provides unique opportunities to manipulate and explore a topological insulator phase. However, an obstacle to engineering such tunability is the subtlety of transport-based discriminants for topological phases. In this work, the quantum capacitance of cadmium arsenide–based heterostructures provides two direct experimental signatures of three-dimensional topological insulator physics: an insulating three-dimensional bulk and a Landau level at zero energy that does not disperse in a magnetic field. We proceed to join our ability to see these fingerprints of the topological surface states with flexibility afforded by our epitaxial heterostructures to demonstrate a route toward controlling the energy of the Dirac nodes on each surface. These results point to new avenues for engineering topological insulators based on cadmium arsenide. American Association for the Advancement of Science 2022-07-08 /pmc/articles/PMC9269884/ /pubmed/35857456 http://dx.doi.org/10.1126/sciadv.abn4479 Text en Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Physical and Materials Sciences Kealhofer, David A. Kealhofer, Robert Ohara, Daniel Pardue, Tyler N. Stemmer, Susanne Controlling and visualizing Dirac physics in topological semimetal heterostructures |
title | Controlling and visualizing Dirac physics in topological semimetal heterostructures |
title_full | Controlling and visualizing Dirac physics in topological semimetal heterostructures |
title_fullStr | Controlling and visualizing Dirac physics in topological semimetal heterostructures |
title_full_unstemmed | Controlling and visualizing Dirac physics in topological semimetal heterostructures |
title_short | Controlling and visualizing Dirac physics in topological semimetal heterostructures |
title_sort | controlling and visualizing dirac physics in topological semimetal heterostructures |
topic | Physical and Materials Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9269884/ https://www.ncbi.nlm.nih.gov/pubmed/35857456 http://dx.doi.org/10.1126/sciadv.abn4479 |
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