Journal
PHYSICAL REVIEW B
Volume 98, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.174301
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Funding
- University of Chicago Materials Research Science and Engineering Center - National Science Foundation [DMR-1420709]
- Packard Foundation
- NSF EFRI NewLAW Grant [1741685]
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Gyroscopic metamaterials, mechanical structures composed of interacting spinning tops, have recently been found to support one-way topological edge waves. In these structures, the time-reversal symmetry breaking that enables their topological behavior emerges directly from the lattice geometry. Here we show that variations in the lattice geometry can give rise to more complex band topology than has been previously described. A spindle lattice (or truncated hexagonal tiling) of gyroscopes possesses both clockwise and counterclockwise edge modes distributed across several band gaps. Tuning the interaction strength or twisting the lattice structure along a Guest mode opens and closes these gaps and yields bands with Chern numbers of vertical bar C vertical bar > 1 without introducing next-nearest-neighbor interactions or staggered potentials. A deformable honeycomb structure provides a simple model for understanding the role of lattice geometry in constraining the effects of time-reversal symmetry and inversion symmetry breaking Last, we find that topological band structure generically arises in gyroscopic networks, and a simple protocol generates lattices with topological excitations.
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