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dc.contributor.authorJia, Dingen_US
dc.contributor.authorGe, Yongen_US
dc.contributor.authorXue, Haoranen_US
dc.contributor.authorYuan, Shou-qien_US
dc.contributor.authorSun, Hong-xiangen_US
dc.contributor.authorYang, Yihaoen_US
dc.contributor.authorLiu, Xiao-junen_US
dc.contributor.authorZhang, Baileen_US
dc.identifier.citationJia, D., Ge, Y., Xue, H., Yuan, S., Sun, H., Yang, Y., Liu, X. & Zhang, B. (2021). Topological refraction in dual-band valley sonic crystals. Physical Review B, 103(14), 144309-.
dc.description.abstractValley pseudospins, as quantum states of energy extrema in momentum space, have been introduced from condensed-matter systems into classical sound systems, and several valley sonic crystals (VSCs) have been realized experimentally. However, in the existing VSCs, topological kink states generally appear in a single band gap, which apparently has become an obstacle for multiband topological sound devices. To overcome this challenge, we here experimentally demonstrate dual-band VSCs, in which robust valley kink states exist in two separated bulk band gaps. More interestingly, two opposite valleys separately located in two band gaps are locked to a single propagation direction, which arises from the fact that the bands below two band gaps show opposite valley Chern numbers at the K/K′ valley. This double valley-locking phenomenon has been demonstrated via measuring the topological refraction of the kink states into the ambient space at a zigzag termination. We observe positive refraction at the lower band gap, whereas the coexistence of positive and negative refraction at the higher band gap. Additionally, we observe the robust valley transport through the sharp corners at two band gaps. The designed VSCs with the dual-band topological refraction and robust valley transport could find potential applications in multiband and multidirectional devices.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.relationMOE2018-T2-1-022 (S)en_US
dc.relationRG174/16 (S)en_US
dc.relation.ispartofPhysical Review Ben_US
dc.rights© 2021 American Physical Society (APS). All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society (APS).en_US
dc.titleTopological refraction in dual-band valley sonic crystalsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.researchCentre for Disruptive Photonic Technologies (CDPT)en_US
dc.contributor.researchThe Photonics Instituteen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsAcoustic Wave Phenomenaen_US
dc.description.acknowledgementThis work was supported by the National Natural Science Foundation of China (Grants No. 11774137, No. 51779107, and No. 11834008), the National Key R&D Program of China (Grants No. 2020YFC1512400 and No. 2020YFC1512403), the Singapore Ministry of Education [Grants No. MOE2018-T2-1-022 (S), No. MOE2016-T3-1-006, and Tier 1 RG174/16 (S)], State Key Laboratory of Acoustics, Chinese Academy of Science (Grant No. SKLA202016), and the China Postdoctoral Science Foundation (Grant No. 2020M671351).en_US
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