For odd-sized quantum spin lattices with conserved spin parity and long-range order, a slowly removed field leaves a macroscopic magnetization, giving finite-size spontaneous symmetry breaking and Heisenberg-scaled spin squeezing.
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Giant number-parity effect leading to spontaneous symmetry breaking in finite-size quantum spin models
For odd-sized quantum spin lattices with conserved spin parity and long-range order, a slowly removed field leaves a macroscopic magnetization, giving finite-size spontaneous symmetry breaking and Heisenberg-scaled spin squeezing.