Observation of Gigahertz Topological Valley Hall Effect in Nanoelectromechanical Phononic Crystals

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dc.creatorZhang, Qicheng
dc.creatorLee, Daehun
dc.creatorZheng, Lu
dc.creatorMa, Xuejian
dc.creatorMeyer, Shawn I.
dc.creatorHe, Li
dc.creatorYe, Han
dc.creatorGong, Ze
dc.creatorZhen, Bo
dc.creatorLai, Keji
dc.creatorJohnson, A. T. Charlie
dc.date.accessioned2024-02-05T14:55:38Z
dc.date.available2024-02-05T14:55:38Z
dc.date.issued2022-02-04
dc.description.abstractTopological phononics offers numerous opportunities in manipulating elastic waves that can propagate in solids without being backscattered. Due to the lack of nanoscale imaging tools that aid the system design, however, acoustic topological metamaterials have been mostly demonstrated in macroscale systems operating at low (kilohertz to megahertz) frequencies. Here, we report the realization of gigahertz topological valley Hall effect in nanoelectromechanical AlN membranes. Propagation of elastic wave through phononic crystals is directly visualized by microwave microscopy with unprecedented sensitivity and spatial resolution. The valley Hall edge states, protected by band topology, are vividly seen in both real- and momentum-space. The robust valley-polarized transport is evident from the wave transmission across local disorder and around sharp corners, as well as the power distribution into multiple edge channels. Our work paves the way to exploit topological physics in integrated acousto-electronic systems for classical and quantum information processing in the microwave regime.
dc.description.departmentCenter for Dynamics and Control of Materials
dc.description.sponsorshipThis work was supported by the NSF through the Laboratory for Research on the Structure of Matter, an NSF Materials Research Science & Engineering Center (MRSEC; DMR-1720530). The TMIM work was supported by NSF Division of Materials Research Award DMR-2004536 and Welch Foundation Grant F-1814. The data analysis was partially supported by the NSF through the Center for Dynamics and Control of Materials, an NSF MRSEC under Cooperative Agreement DMR-1720595. This work was carried out in part at the Singh Center for Nanotechnology, which is supported by the NSF National Nanotechnology Coordinated Infrastructure Program under grant NNCI-2025608. The metamaterial design and simulation work was supported by the US Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) grant N00014- 20-1-2325 on Robust Photonic Materials with High-Order Topological Protection and grant N00014-21-1-2703. We would like to express our appreciation for useful discussions with Prof. Troy Olsson and Dr. Qian Niu.
dc.identifier.doihttps://doi.org/10.48550/arXiv.2202.02412
dc.identifier.urihttps://hdl.handle.net/2152/123577
dc.identifier.urihttps://doi.org/10.26153/tsw/50371
dc.language.isoen_US
dc.relation.ispartofCenter for Dynamics and Control of Materials Publications
dc.rights.restrictionOpen
dc.subjectPhononic Crystals
dc.titleObservation of Gigahertz Topological Valley Hall Effect in Nanoelectromechanical Phononic Crystals
dc.typeArticle

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