Back to Search
Start Over
Three-dimensional topological acoustic crystals with pseudospin-valley coupled saddle surface states
- Source :
- Nature Communications, Nature Communications, Vol 9, Iss 1, Pp 1-7 (2018)
- Publication Year :
- 2018
-
Abstract
- Topological valley states at the domain wall between two artificial crystals with opposite valley Chern numbers offer a feasible way to realize robust wave transport since only broken spatial symmetry is required. In addition to the valley, spin and crystal dimension are two other important degrees of freedom, particularly in realizing spin-related topological phenomena. Here we experimentally demonstrate that it is possible to construct two-dimensional acoustic topological pseudospin-valley coupled saddle surface states, designed from glide symmetry in a three-dimensional system. By taking advantage of such two-dimensional surface states, a full set of acoustic pseudospins can be realized, exhibiting pseudospin-valley dependent transport. Furthermore, due to the hyperbolic character of the dispersion of saddle surface states, multi-directional anisotropic controllable robust sound transport with little backscattering is observed. Our findings may open research frontiers for acoustic pseudospins and provide a satisfactory platform for exploring unique acoustic topological properties in three-dimensional structures.<br />Valley states can be used to realise topologically protected transport. Here, He et al. show that considering additional degrees of freedom, together with glide symmetry, allow the design of 2D acoustic topological pseudospin-valley coupled saddle surface states in 3D structures.
- Subjects :
- Science
Degrees of freedom (statistics)
General Physics and Astronomy
02 engineering and technology
Topology
01 natural sciences
General Biochemistry, Genetics and Molecular Biology
Article
Domain wall (string theory)
0103 physical sciences
010306 general physics
Anisotropy
Dispersion (water waves)
lcsh:Science
Saddle
Surface states
Spin-½
Physics
Multidisciplinary
General Chemistry
021001 nanoscience & nanotechnology
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Symmetry (physics)
lcsh:Q
0210 nano-technology
Subjects
Details
- ISSN :
- 20411723
- Volume :
- 9
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Nature communications
- Accession number :
- edsair.doi.dedup.....4b114b1e1732717e99fd3134e1eaf295