Synthetic-gauge-field-induced Dirac semimetal state in an acoustic resonator system

Recently, a proposal of synthetic gauge field in reduced two-dimensional (2D) system from three-dimensional (3D) acoustic structure shows an analogue of the gapped Haldane model with fixed k z , and achieves the gapless Weyl semimetal phase in 3D momentum space. Here, extending this approach of synt...

Fuld beskrivelse

Bibliografiske detaljer
Main Authors: Yang, Zhaoju, Gao, Fei, Shi, Xihang, Zhang, Baile
Andre forfattere: School of Physical and Mathematical Sciences
Format: Journal Article
Sprog:English
Udgivet: 2017
Fag:
Online adgang:https://hdl.handle.net/10356/84076
http://hdl.handle.net/10220/42919
Beskrivelse
Summary:Recently, a proposal of synthetic gauge field in reduced two-dimensional (2D) system from three-dimensional (3D) acoustic structure shows an analogue of the gapped Haldane model with fixed k z , and achieves the gapless Weyl semimetal phase in 3D momentum space. Here, extending this approach of synthetic gauge flux, we propose a reduced square lattice of acoustic resonators, which exhibits Dirac nodes with broken effective time-reversal symmetry. Protected by an additional hidden symmetry, these Dirac nodes with quantized values of topological charge are characterized by nonzero winding number and the finite structure exhibits flat edge modes that cannot be destroyed by perturbations.