Defective Majorana zero modes in a non-Hermitian Kitaev chain

Article

关键词: NON-ABELIAN STATISTICS;    NANOWIRE;    FERMIONS;    STATES;    PARITY;   

DOI  :  10.1103/PhysRevB.104.205131

来源: SCIE

【 摘 要 】

Topological stability is an important property for topological materials. However, the non-Hermitian effects may change this situation. Here, we investigate the robustness of edge states in the non-Hermitian Kitaev chain with an imbalanced tunneling term and a superconducting pairing term. By defining the similarity of Majorana zero modes (MZMs) and magnetic factor, the coalescing phase diagram of the MZMs and corresponding spin polarization phase diagram are provided. Because of the non-Hermitian coalescence effect and non-Hermitian suppression effect induced by the breakdown of sublattice symmetry and particle-hole symmetry, the system emerges with very interesting phenomena, such as defective MZMs, number-anomalous bulk-boundary correspondence, coalescence of many-body ground states, and the magnetic phase crossover without gap closing. Those non-Hermitian effects offer fresh insights into MZMs and topological physics.

【 授权许可】

Free