Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
Abstract 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 experimen...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-03-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-46517-z |
| _version_ | 1797259172140548096 |
|---|---|
| author | Zheyu Cheng Yi-Jun Guan Haoran Xue Yong Ge Ding Jia Yang Long Shou-Qi Yuan Hong-Xiang Sun Yidong Chong Baile Zhang |
| author_facet | Zheyu Cheng Yi-Jun Guan Haoran Xue Yong Ge Ding Jia Yang Long Shou-Qi Yuan Hong-Xiang Sun Yidong Chong Baile Zhang |
| author_sort | Zheyu Cheng |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-04-24T23:05:12Z |
| format | Article |
| id | doaj.art-afd4f3c529124468b5833eed84dad233 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-04-24T23:05:12Z |
| publishDate | 2024-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-afd4f3c529124468b5833eed84dad2332024-03-17T12:31:37ZengNature PortfolioNature Communications2041-17232024-03-011511810.1038/s41467-024-46517-zThree-dimensional flat Landau levels in an inhomogeneous acoustic crystalZheyu Cheng0Yi-Jun Guan1Haoran Xue2Yong Ge3Ding Jia4Yang Long5Shou-Qi Yuan6Hong-Xiang Sun7Yidong Chong8Baile Zhang9Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu UniversityDepartment of Physics, The Chinese University of Hong KongResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu UniversityResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu UniversityDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu UniversityResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu UniversityDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological UniversityAbstract 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.https://doi.org/10.1038/s41467-024-46517-z |
| spellingShingle | Zheyu Cheng Yi-Jun Guan Haoran Xue Yong Ge Ding Jia Yang Long Shou-Qi Yuan Hong-Xiang Sun Yidong Chong Baile Zhang Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal Nature Communications |
| title | 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_short | Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal |
| title_sort | three dimensional flat landau levels in an inhomogeneous acoustic crystal |
| url | https://doi.org/10.1038/s41467-024-46517-z |
| work_keys_str_mv | AT zheyucheng threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT yijunguan threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT haoranxue threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT yongge threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT dingjia threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT yanglong threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT shouqiyuan threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT hongxiangsun threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT yidongchong threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal AT bailezhang threedimensionalflatlandaulevelsinaninhomogeneousacousticcrystal |