Pairing-induced phase transition in the non-reciprocal Kitaev chain
- URL: http://arxiv.org/abs/2510.24851v1
- Date: Tue, 28 Oct 2025 18:01:02 GMT
- Title: Pairing-induced phase transition in the non-reciprocal Kitaev chain
- Authors: Pietro Brighi, Andreas Nunnenkamp,
- Abstract summary: We induce non-reciprocal hopping and pairing in the fermionic Kitaev chain.<n>We reveal the emergence of a pairing-induced phase transition.<n>Our work highlights the non-trivial breakdown of non-reciprocity due to superconducting pairing.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Investigating the robustness of non-reciprocity in the presence of competing interactions is central to understanding non-reciprocal quantum matter. In this work, we use reservoir engineering to induce non-reciprocal hopping and pairing in the fermionic Kitaev chain, and reveal the emergence of a pairing-induced phase transition. The two phases appear in the spectrum of the non-Hermitian Kitaev Hamiltonian describing the dynamics of correlations, separated by an exceptional point. In the non-reciprocal phase, dynamics are characterized by directionality and slow relaxation, and the steady state supports non-reciprocal density and spatial correlations. At strong pairing, we uncover an unexpected density wave phase, featuring short relaxation times, a modulation in particle occupation and strikingly different correlation spreading depending on pairing non-reciprocity. Our work highlights the non-trivial breakdown of non-reciprocity due to superconducting pairing and invites experimental investigation of non-reciprocal fermionic systems.
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