Acoustic Landau quantization and quantum-Hall-like edge states

Many intriguing phenomena occur for electrons under strong magnetic fields 1 , 2 . Recently, it was shown that an appropriate strain texture in graphene could induce a synthetic gauge field 3 – 6 , in which electrons behave as they do in a real magnetic field 7 – 11 . This enabled the control of qua...

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Veröffentlicht in:Nature physics 2019-04, Vol.15 (4), p.352-356
Hauptverfasser: Wen, Xinhua, Qiu, Chunyin, Qi, Yajuan, Ye, Liping, Ke, Manzhu, Zhang, Fan, Liu, Zhengyou
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container_end_page 356
container_issue 4
container_start_page 352
container_title Nature physics
container_volume 15
creator Wen, Xinhua
Qiu, Chunyin
Qi, Yajuan
Ye, Liping
Ke, Manzhu
Zhang, Fan
Liu, Zhengyou
description Many intriguing phenomena occur for electrons under strong magnetic fields 1 , 2 . Recently, it was shown that an appropriate strain texture in graphene could induce a synthetic gauge field 3 – 6 , in which electrons behave as they do in a real magnetic field 7 – 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 molecular 12 and photonic 13 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 fields 5 , 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.
doi_str_mv 10.1038/s41567-019-0446-3
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subjects 639/301/119/2794
639/766/119/2792/4128
Acoustics
Atomic
Classical and Continuum Physics
Complex Systems
Condensed Matter Physics
Controllability
Deformation
Electrons
Graphene
Lattices
Letter
Mathematical and Computational Physics
Molecular
Optical and Plasma Physics
Physics
Physics and Astronomy
Quantum transport
Stability
Theoretical
title Acoustic Landau quantization and quantum-Hall-like edge states
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