Year: 2015
Type: article
Abstract: We report a new type of phononic crystals with topologically nontrivial band gaps for both longitudinal and transverse polarizations, resulting in protected one-way elastic edge waves. In our design, gyroscopic inertial effects are used to break the time-reversal symmetry and realize the phononic analogue of the electronic quantum (anomalous) Hall effect. We investigate the response of both hexagonal and square gyroscopic lattices and observe bulk Chern numbers of 1 and 2, indicating that these structures support single and multimode edge elastic waves immune to backscattering. These robust one-way phononic waveguides could potentially lead to the design of a novel class of surface wave devices that are widely used in electronics, telecommunication, and acoustic imaging.
Source: Physical Review Letters
Authors: Pai Wang, Ling Lu, Katia Bertoldi
Institutions: Harvard University, Massachusetts Institute of Technology
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, Harvard University, Harvard School of Engineering and Applied Sciences, Materials Research Science and Engineering Center, Harvard University, Solid-State Solar Thermal Energy Conversion, Massachusetts Institute of Technology, Hansjörg Wyss Institute for Biologically Inspired Engineering, Harvard University, Division of Materials Research, Division of Civil, Mechanical and Manufacturing Innovation, Kavli Institute for Theoretical Physics, University of California, Santa Barbara
Awards: G1020486556, G1281813165, SNM: Digital Optofluidic Self Assembly of Heterogeneous Metamaterials, G2254063607, G2626327161, G2800520821, G318041215, G3202401936, G3366412161, G3387330441, G391170236, G3953734904, G4220372196, NEW: SOLID-STATE SOLAR-THERMAL ENERGY CONVERSION CENTER (S3TEC CENTER) -- EFRC; PI - GANG CHEN, G6711204355, MIT Materials Research Science and Engineering Center - Full Proposal, CAREER: BuckliOrigami: Soft, Active and Foldable Structures Through Instabilities and Large Deformation, Materials Research Science and Engineering Center
OpenAlex ID: W1664907837