Acoustic Dirac degeneracy and topological phase transitions realized by rotating scatterers

The artificial crystals for classical waves provide a good platform to explore the topological physics proposed originally in condensed matter systems. In this paper, acoustic Dirac degeneracy is realized by simply rotating the scatterers in sonic crystals, where the degeneracy is induced accidental...

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Veröffentlicht in:Journal of applied physics 2018-03, Vol.123 (9)
Hauptverfasser: Wen, Xinhua, Qiu, Chunyin, Lu, Jiuyang, He, Hailong, Ke, Manzhu, Liu, Zhengyou
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Sprache:eng
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Zusammenfassung:The artificial crystals for classical waves provide a good platform to explore the topological physics proposed originally in condensed matter systems. In this paper, acoustic Dirac degeneracy is realized by simply rotating the scatterers in sonic crystals, where the degeneracy is induced accidentally by modulating the scattering strength among the scatterers during the rotation process. This gives a flexible way to create a topological phase transition in acoustic systems. Edge states are further observed along the interface separating the two topologically distinct gapped sonic crystals.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5004073