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Discovering topological surface states of Dirac points

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arxiv 2001.06205 v1 pith:6F7C522S submitted 2020-01-17 cond-mat.mtrl-sci cond-mat.mes-hall

Discovering topological surface states of Dirac points

classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords surfacediracstatesmaterialspointstopologicalacousticarcs
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Dirac materials, unlike the Weyl materials, have not been found in experiments to support intrinsic topological surface states, as the surface arcs in existing systems are unstable against symmetry-preserving perturbations. Utilizing the proposed glide and time-reversal symmetries, we theoretically design and experimentally verify an acoustic crystal of two frequency-isolated three-dimensional Dirac points with $Z_2$ monopole charges and four gapless helicoid surface states.

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