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arXiv · 2610.24669

Spontaneous particle-hole symmetry breaking in a disordered two-site quantum breakdown model

Kinya Guan
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Abstract

We study spontaneous particle-hole symmetry breaking in a disordered two-site quantum breakdown model. The model is solvable in the limit of a large number of fermionic modes on each site. For a small ratio of the numbers of modes on the two sites, we derive the free energy analytically and find a finite-temperature symmetry-breaking transition. This transition changes from continuous to first order as the number of fermions produced in each conversion increases. Numerical results show that both types of transition persist beyond this regime, with an order-parameter exponent close to $1/2$ for continuous transitions.

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Kinya Guan. 2026-10-17. Spontaneous particle-hole symmetry breaking in a disordered two-site quantum breakdown model. https://arxiv.org/abs/2610.24669

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