Acoustic Landau quantization and quantum-Hall-like edge states

By Xinhua Wen, Chunyin Qiu, Y. Qi, Liping Ye, M. Ke, Fan Zhang, Zhengyou Liu. Nature Physics, 2018

142 citations recorded by the source corpus.

Many intriguing phenomena occur for electrons under strong magnetic fields1,2. Recently, it was shown that an appropriate strain texture in graphene could induce a synthetic gauge field3–6, in which electrons behave as they do in a real magnetic field7–11. This enabled the control of quantum transport by mechanical means and allowed the unreached high-field regime to be explored. Such synthetic gauge fields have been achieved in molecular12 and photonic13 lattices. Here we report an experimental realization of a giant uniform pseudomagnetic field in acoustics by introducing a simple uniaxial deformation to the acoustic graphene. The controllability of our macroscopic platform enables us to observe the acoustic Landau levels in frequency-resolved spectroscopy and their spatial localization in pressure-field distributions. We further visualize the quantum-Hall-like edge states (connected to the zeroth Landau level), which have been elusive owing to the difficulty in creating large-area uniform pseudomagnetic fields5,6. These results, consistent with our full-wave simulations, establish a complete framework for artificial structures under constant pseudomagnetic fields. Our findings may also offer opportunities to manipulate sound in conceptually novel ways.A graphene-like two-dimensional sonic crystal, under uniaxial deformation, experiences a giant uniform pseudomagnetic field. This leads to the quantization of the cyclotron orbits—a kind of acoustic Landau level—that is observed here.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a10634b4eb9499b2f49cf96ae96755343f3d9404

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Guancong Ma
2. M. Xiao
3. C. T. Chan
4. Baile Zhang
5. Haoran Xue
6. Yihao Yang
7. Douglas H. Werner
8. Do-Hoon Kwon

In Materials Chemistry

1. C. T. Chan
2. M. Xiao
3. Baile Zhang
4. Guancong Ma
5. Haoran Xue
6. Yihao Yang

Citations in the corpus

• Topological acoustics (2022, background): “for Dirac points in 2D [32] and Weyl points in 3D [34].”
• Topological phases in acoustic and mechanical systems (2019, background): “It has also been shown that a specific strain field in a graphene lattice can be regarded as a gauge potential that leads to a pseudo-magnetic field 29,30 .”