Observing multifarious topological phase transitions with real-space indicator.

ABSTRACT: First- and second-order topological phases, capable of inherent protection against disorder of materials, have been recently experimentally demonstrated in various artificial materials through observing the topologically protected edge states. Topological phase transition represents a new class of quantum critical phenomena, which is accompanied by the changes related to the bulk topology of energy band structures instead of symmetry. However, it is still a challenge to directly observe the topological phase transitions defined in terms of bulk states. Here, we theoretically and experimentally demonstrate the direct observation of multifarious topological phase transitions with real-space indicator in a single photonic chip, which is formed by integration of 324 × 33 waveguides supporting

SUBMITTER: Lu YH 

PROVIDER: S-EPMC11501473 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature