On-Chip Elastic Wave Manipulations Based on Synthetic Dimension.

Area of Science:

• Condensed matter physics
• Mechanical metamaterials
• Topological physics

Background:

• Controlling elastic waves in lower-dimensional mechanical metamaterials is crucial for on-chip devices.
• Experimental control of elastic waves in higher dimensions remains challenging.

Purpose of the Study:

• To introduce a novel method for synthesizing and investigating higher-dimensional elastic wave manipulation.
• To explore Weyl physics and topological phenomena in silicon-on-insulator systems.

Main Methods:

• Introducing an extra structural parameter to engineer an in-plane pseudomagnetic field.
• Utilizing a synthetic dimension approach for multidimensional wave control.
• Investigating chiral Landau levels and pseudomagnetic field-induced boundary states.

Main Results:

• Realization of chiral Landau levels supporting robust bulk energy transport.
• Observation of unique pseudomagnetic field-induced boundary states distinct from topological corner states.
• Demonstration of multidimensional elastic wave manipulation on an integrated platform.

Conclusions:

• The proposed method enables exploration of higher-dimensional physics on integrated platforms.
• This work offers a new strategy for designing advanced elastic functional devices.
• The findings pave the way for novel on-chip elastic wave manipulation techniques.