$\eta$-pairing ground states in the non-Hermitian Hubbard model

Abstract

The introduction of non-Hermiticity has greatly enriched the research field of traditional condensed matter physics, and eventually led to a series of discoveries of exotic phenomena. We investigate the effect of non-Hermitian imaginary hoppings on the attractive Hubbard model. The exact bound-pair solution shows that the electron-electron correlation suppresses the non-Hermiticity, resulting in off-diagonal long-range order (ODLRO) ground state. In a large negative $U$ limit, the ODLRO ground state corresponds to $\eta$-spin ferromagnetic states. We also study the system with mixed hopping configuration. The numerical result indicates the existence of the transition from normal to $\eta$-pairing ground states by increasing the imaginary hopping strength. Our results provide a promising approach for the non-Hermitian strongly correlated system.

10 pages, 4 figures

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• Dynamic generation of nonequilibrium superconducting states in Kitaev chain
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• Transfer learning from Hermitian to non-Hermitian quantum many-body physics
• Spin-Depairing-Induced Exceptional Fermionic Superfluidity
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• Field induced conducting state in Mott insulator
• Asymptotically exact solution of the non-Hermitian disordered interacting Hatano-Nelson chain