Pseudomagnetic fields enabled manipulation of on-chip elastic waves

M Yan, W Deng, X Huang, Y Wu, Y Yang, J Lu, F Li… - Physical Review Letters, 2021 - APS
M Yan, W Deng, X Huang, Y Wu, Y Yang, J Lu, F Li, Z Liu
Physical Review Letters, 2021APS
The physical realization of pseudomagnetic fields (PMFs) is an engaging frontier of
research. As in graphene, elastic PMF can be realized by the structural modulations of Dirac
materials. We show that, in the presence of PMFs, the conical dispersions split into elastic
Landau levels, and the elastic modes robustly propagate along the edges, similar to the
quantum Hall edge transports. In particular, we reveal unique elastic snake states in an on-
chip heterostructure with two opposite PMFs. The flexibility in the micromanufacture of …
The physical realization of pseudomagnetic fields (PMFs) is an engaging frontier of research. As in graphene, elastic PMF can be realized by the structural modulations of Dirac materials. We show that, in the presence of PMFs, the conical dispersions split into elastic Landau levels, and the elastic modes robustly propagate along the edges, similar to the quantum Hall edge transports. In particular, we reveal unique elastic snake states in an on-chip heterostructure with two opposite PMFs. The flexibility in the micromanufacture of silicon chips and the low loss of elastic waves provide an unprecedented opportunity to demonstrate various fascinating topological transports of the edge states under PMFs. These properties open new possibilities for designing functional elastic wave devices in miniature and compact scales.
American Physical Society
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