Recent Research

Losing Hermiticity, Obtaining Majorana: When Symmetry Meets Non-Hermiticity in Topological Superconductivity

Symmetry and topology are known to reshape electronic systems and give rise to diverse quantum states and phenomena. Extending these concepts to the non-Hermitian regime, Dr. Chen-Hsuan Hsu’s team at the Institute of Physics has developed a topological superconducting model that incorporates all internal symmetries allowed in non-Hermitian systems, including time-reversal, particle–hole (and their daggered counterparts), sublattice and chiral symmetries, as well as pseudo-Hermiticity. The model exhibits rich spectral and eigenstate structures enabled by these symmetries, including complex flat bands and Majorana zero modes, together with a rich phase diagram. This work, published in Physical Review Research, was carried out in collaboration with Prof. Nobuyuki Okuma (Kyushu Institute of Technology) and Prof. Hsien-Chung Kao (National Taiwan Normal University), with support from the Academia Sinica Grid Centre (ASGC).

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WebSite: https://doi.org/10.1103/v5k2-1vj9