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Higher-Order Dirac Sonic Crystals.

Huahui Qiu1, Meng Xiao1, Fan Zhang2

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|October 15, 2021
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Summary
This summary is machine-generated.

Researchers discovered a new higher-order topological phase in a sonic crystal, realizing fascinating hinge states. This breakthrough in topological materials opens avenues for manipulating classical waves like sound and light.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Acoustics

Background:

  • Topological phases of matter are crucial in physics and materials science.
  • Dirac semimetals are key for studying topological phase transitions.
  • Higher-order topological phases, including hinge states, were theoretically predicted but experimentally unachieved.

Purpose of the Study:

  • To propose a minimal model for a spinless higher-order Dirac semimetal.
  • To explore topological phase transitions into novel phases like higher-order topological insulators and Weyl semimetals.
  • To experimentally realize this higher-order topological phase and observe hinge states.

Main Methods:

  • Theoretical proposal of a spinless higher-order Dirac semimetal model protected by C_{6v} symmetry.
  • Symmetry breaking analysis to predict transitions to other topological phases.
  • Experimental realization using a sonic crystal.
  • Observation of hinge states via momentum-space spectroscopy and real-space visualization.

Main Results:

  • Successfully constructed a spinless higher-order Dirac semimetal model.
  • Demonstrated transitions to higher-order topological insulator, Weyl semimetal, and nodal-ring semimetal phases.
  • Experimentally realized the higher-order topological phase in a sonic crystal.
  • Unambiguously observed predicted hinge states in the sonic crystal.

Conclusions:

  • The experimental realization of higher-order topological phases is now achievable.
  • Sonic crystals provide a platform for studying novel topological phenomena.
  • Findings offer potential for manipulating classical waves, including sound and light.