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Researchers at Southeast University have demonstrated that the identity term within a Hamiltonian actively drives Non-Hermitian topology, overturning long-held assumptions regarding spectral inertness. By solving an exact analytical model for Hatano-Nelson chains with spin-orbit coupling, this work establishes new benchmarks for topological invariants beyond traditional symmetry protection mechanisms. This fundamental shift in understanding non-Hermitian systems is critical for advancing quantum material design and robust state engineering where conventional symmetries are absent.
Southeast University Team Uncovers Inert Term’s Topology Role
Researchers at Southeast University discovered an “inert” Hamiltonian term impacts a system’s topology, challenging prior assumptions about eigenstates.
Researchers at Southeast University in Nanjing, China, have revealed a surprising role for a component of physics typically considered inconsequential. The team demonstrates that an identity term in the Hamiltonian, conventionally regarded as spectrally inert and therefore negligible, can actively drive a specific type of topology known as Non-Hermitian topology. This discovery challenges established criteria for understanding these systems, as the identity term deforms the generalized Brillouin zone under non-Hermitian skin pumping. By achieving an exact analytical solution with a Hatano-Nelson chain incorporating spin-orbit coupling, the researchers have established a rigorous benchmark for testing topological invariants in systems with momentum-dependent identity terms, opening new avenues…
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