期刊
PHYSICAL REVIEW B
卷 89, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.134302
关键词
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资金
- National Natural Science Foundation of China [11174225, 11004155, 11374233, J1210061]
- Open Foundation from State Key Laboratory of Applied Optics of China
- Program for New Century Excellent Talents [NCET-11-0398]
- China Postdoctoral Science Special Foundation [201104491]
We present a study on the existence of Dirac cones in two-dimensional phononic crystals. Specifically, we start from the phononic crystals made of rotatable regular hexagonal or triangular rods arranged in a hexagonal lattice. The additional freedom of the rotation enables the crystals with various symmetries. The numerical and experimental band structures manifest consistently that part of the symmetries can support Dirac cones stably, yet the others cannot. The phenomena are explained successfully by the k . p perturbation theory combined with symmetry analysis. Based on this theoretical framework, a systemic exploration on symmetry is further performed, which yields a complete summary on the existence of Dirac cones. The conclusion also remains in the other types of artificial crystals for classical waves, either scalar or vectorial ones.
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