Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal

When electrons moving in two dimensions (2D) are subjected to a strong uniform magnetic field, they form flat bands called Landau levels (LLs). LLs can also arise from pseudomagnetic fields (PMFs) induced by lattice distortions. In three-dimensional (3D) systems, there has been no experimental demon...

Full description

Saved in:
Bibliographic Details
Main Authors: Cheng, Zheyu, Guan, Yi-Jun, Xue, Haoran, Ge, Yong, Jia, Ding, Long, Yang, Yuan, Shou-Qi, Sun, Hong-Xiang, Chong, Yidong, Zhang, Baile
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2024
Subjects:
Online Access:https://hdl.handle.net/10356/174708
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-174708
record_format dspace
spelling sg-ntu-dr.10356-1747082024-04-08T15:35:17Z Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal Cheng, Zheyu Guan, Yi-Jun Xue, Haoran Ge, Yong Jia, Ding Long, Yang Yuan, Shou-Qi Sun, Hong-Xiang Chong, Yidong Zhang, Baile School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies Physics Anisotropy Landau level When electrons moving in two dimensions (2D) are subjected to a strong uniform magnetic field, they form flat bands called Landau levels (LLs). LLs can also arise from pseudomagnetic fields (PMFs) induced by lattice distortions. In three-dimensional (3D) systems, there has been no experimental demonstration of LLs  as a type of flat band thus far. Here, we report the experimental realization of a flat 3D LL in an acoustic crystal. Starting from a lattice whose bandstructure exhibits a nodal ring, we design an inhomogeneous distortion corresponding to a specific pseudomagnetic vector potential (PVP). This distortion causes the nodal ring states to break up into LLs, including a zeroth LL that is flat along all three directions. These findings suggest the possibility of using nodal ring materials to generate 3D flat bands, allowing access to strong interactions and other attractive physical regimes in 3D. Ministry of Education (MOE) National Research Foundation (NRF) Published version Z.C., Y.L., and B.Z. are supported by the Singapore Ministry of Education Academic Research Fund Tier 2 Grant MOE2019-T2-2- 085, and National Research Foundation (NRF), Singapore under its Competitive Research Programs NRF-CRP23-2019-0007. Y.C. is also supported by the National Research Foundation (NRF), Singapore under its Competitive Research Programs NRF-CRP23-2019- 0005, and NRF Investigatorship NRF-NRFI08-2022-0001. Y.L. gratefully acknowledges the support of the Eric and Wendy Schmidt AI in Science Postdoctoral Fellowship, a Schmidt Futures program. Y.G., Y.G., D.J., S.Y., and H.S. acknowledge support from the National Natural Science Foundation of China under Grant Nos.12274183 and 12174159, and the National Key Research and Development Program of China under Grant No. 2020YFC1512403. H.X. acknowledges support from the start-up fund of The Chinese University of Hong Kong. 2024-04-08T04:30:54Z 2024-04-08T04:30:54Z 2024 Journal Article Cheng, Z., Guan, Y., Xue, H., Ge, Y., Jia, D., Long, Y., Yuan, S., Sun, H., Chong, Y. & Zhang, B. (2024). Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal. Nature Communications, 15(1), 2174-. https://dx.doi.org/10.1038/s41467-024-46517-z 2041-1723 https://hdl.handle.net/10356/174708 10.1038/s41467-024-46517-z 38467627 2-s2.0-85187440346 1 15 2174 en MOE2019-T2-2-085 NRF-CRP23-2019-0007 NRF-CRP23-2019-0005 NRF-NRFI08-2022-0001 Nature communications © The Author(s) 2024, corrected publication 2024. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/ licenses/by/4.0/. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Physics
Anisotropy
Landau level
spellingShingle Physics
Anisotropy
Landau level
Cheng, Zheyu
Guan, Yi-Jun
Xue, Haoran
Ge, Yong
Jia, Ding
Long, Yang
Yuan, Shou-Qi
Sun, Hong-Xiang
Chong, Yidong
Zhang, Baile
Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
description When electrons moving in two dimensions (2D) are subjected to a strong uniform magnetic field, they form flat bands called Landau levels (LLs). LLs can also arise from pseudomagnetic fields (PMFs) induced by lattice distortions. In three-dimensional (3D) systems, there has been no experimental demonstration of LLs  as a type of flat band thus far. Here, we report the experimental realization of a flat 3D LL in an acoustic crystal. Starting from a lattice whose bandstructure exhibits a nodal ring, we design an inhomogeneous distortion corresponding to a specific pseudomagnetic vector potential (PVP). This distortion causes the nodal ring states to break up into LLs, including a zeroth LL that is flat along all three directions. These findings suggest the possibility of using nodal ring materials to generate 3D flat bands, allowing access to strong interactions and other attractive physical regimes in 3D.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Cheng, Zheyu
Guan, Yi-Jun
Xue, Haoran
Ge, Yong
Jia, Ding
Long, Yang
Yuan, Shou-Qi
Sun, Hong-Xiang
Chong, Yidong
Zhang, Baile
format Article
author Cheng, Zheyu
Guan, Yi-Jun
Xue, Haoran
Ge, Yong
Jia, Ding
Long, Yang
Yuan, Shou-Qi
Sun, Hong-Xiang
Chong, Yidong
Zhang, Baile
author_sort Cheng, Zheyu
title Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
title_short Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
title_full Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
title_fullStr Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
title_full_unstemmed Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
title_sort three-dimensional flat landau levels in an inhomogeneous acoustic crystal
publishDate 2024
url https://hdl.handle.net/10356/174708
_version_ 1800916376079040512