Publications by authors named "Zhenxiao Zhu"
Brillouin Klein space and half-turn space in three-dimensional acoustic crystals.
Sci Bull (Beijing)
July 2024
Article Synopsis
- The Bloch band theory and Brillouin zone are key concepts in physics that describe wave behavior in periodic structures, crucial for fields like condensed matter and topological physics.
- Recent advances have shown that the traditional 2D Brillouin zone can be transformed into a non-orientable Klein bottle due to artificial gauge fields, but similar investigations for the 3D Brillouin zone were lacking.
- New theoretical and experimental findings reveal that the 3D Brillouin zone can also be altered to exhibit unusual topologies, leading to the discovery of novel symmetries and a unique type of topological insulator, paving the way for new research in topological physics and acoustic wave manipulation.
Chiral edge states that propagate oppositely at two parallel strip edges are a hallmark feature of Chern insulators which were first proposed in the celebrated two-dimensional (2D) Haldane model. Subsequently, counterintuitive antichiral edge states that propagate in the same direction at two parallel strip edges were discovered in a 2D modified Haldane model. Recently, chiral surface states, the 2D extension of one-dimensional (1D) chiral edge states, have also been observed in a photonic analogue of a 3D Haldane model.
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- * Recent theoretical advancements suggest that gauge symmetry allows for the possibility of switching between these spin classes.
- * This study experimentally demonstrates spinful topological phases in spinless acoustic crystals, achieving a one-dimensional phase with a 2Z winding number and degenerate boundary modes, challenging previous limitations on topological phases.
Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators.
Phys Rev Lett
September 2022
Dirac cones (DCs) play a pivotal role in various unique phenomena ranging from massless electrons in graphene to robust surface states in topological insulators (TIs). Recent studies have theoretically revealed a full Dirac hierarchy comprising an eightfold bulk DC, a fourfold surface DC, and a twofold hinge DC, associated with a hierarchy of topological phases including first-order to third-order three-dimensional (3D) topological insulators, using the same 3D base lattice. Here, we report the first experimental observation of the Dirac hierarchy in 3D acoustic TIs.
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