TY - JOUR
T1 - Topological helical edge states in water waves over a topographical bottom
AU - Wu, Shi qiao
AU - Wu, Ying
AU - Mei, Jun
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The work described here is supported by the National Natural Science Foundation of China (Grant Nos.11274120 and 11574087) and King Abdullah University of Science and Technology (KAUST)
PY - 2018/2/23
Y1 - 2018/2/23
N2 - We present the discovery of topologically protected helical edge states in water wave systems, which are realized in water wave propagating over a topographical bottom whose height is modulated periodically in a two-dimensional triangular pattern. We develop an effective Hamiltonian to characterize the dispersion relation and use spin Chern numbers to classify the topology. Through full wave simulations we unambiguously demonstrate the robustness of the helical edge states which are immune to defects and disorders so that the backscattering loss is significantly reduced. A spin splitter is designed for water wave systems, where helical edge states with different spin orientations are spatially separated with each other, and potential applications are discussed.
AB - We present the discovery of topologically protected helical edge states in water wave systems, which are realized in water wave propagating over a topographical bottom whose height is modulated periodically in a two-dimensional triangular pattern. We develop an effective Hamiltonian to characterize the dispersion relation and use spin Chern numbers to classify the topology. Through full wave simulations we unambiguously demonstrate the robustness of the helical edge states which are immune to defects and disorders so that the backscattering loss is significantly reduced. A spin splitter is designed for water wave systems, where helical edge states with different spin orientations are spatially separated with each other, and potential applications are discussed.
UR - http://hdl.handle.net/10754/626287
UR - http://iopscience.iop.org/article/10.1088/1367-2630/aa9cdb
UR - http://www.scopus.com/inward/record.url?scp=85043466462&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/aa9cdb
DO - 10.1088/1367-2630/aa9cdb
M3 - Article
AN - SCOPUS:85043466462
SN - 1367-2630
VL - 20
SP - 023051
JO - New Journal of Physics
JF - New Journal of Physics
IS - 2
ER -