Fermion Casimir effect and magnetic Larkin-Ovchinnikov phases

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Abstract
This paper explores how magnetic fields affect the Casimir effect within the context of a simple quasi-1D interacting fermionic system. A novel phenomenon emerges, resulting from the interaction between external magnetic fields and boundary conditions, which alters the ground state in complex ways and leads to first-order phase transitions among various ground states, specifically inhomogeneous solutions with differing node counts. We calculate the Casimir force, which exhibits discontinuities (jumps) at the transition points between the different ground states.
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  • Japan Society for the Promotion of Science (21K03540, JP22H01221, JP24K06974, 19K14616, 20H01838)
  • Hiroshima University

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