TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.19.2.055
TI  - Emergent criticality in a constrained boson model
PY  - 2025/08/25
UR  - https://scipost.org/SciPostPhys.19.2.055
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 19
IS  - 2
SP  - 055
A1  - Menon, Anirudha
AU  - Chattopadhyay, Anwesha
AU  - Sengupta, Krishnendu
AU  - Sen, Arnab
AB  - We show, via explicit computation on a constrained bosonic model, that the presence of subsystem symmetries can lead to a quantum phase transition (QPT) where the critical point exhibits an emergent enhanced symmetry. Such a transition separates a unique gapped ground state from a gapless one; the latter phase exhibits a broken $Z_2$ symmetry which we tie to the presence of the subsystem symmetries in the model. The intermediate critical point separating these phases exhibits an additional emergent $Z_2$ symmetry which we identify. This emergence leads to a critical theory which seems to be different from those in the Ising universality class. Instead, within the data obtained from finite-size scaling analysis, we find the critical theory to be not inconsistent with Ashkin-Teller universality in the sense that the transitions of the model reproduces a critical line with variable correlation length exponent $\nu$ but constant central charge $c$ close to unity. We verify this scenario via explicit exact-diagonalization computations, provide an effective Landau-Ginzburg theory for such a transition, and discuss the connection of our model to the PXP model describing Rydberg atom arrays.
ER  -

@Article{10.21468/SciPostPhys.19.2.055,
	title={{Emergent criticality in a constrained boson model}},
	author={Anirudha Menon and Anwesha Chattopadhyay and Krishnendu Sengupta and Arnab Sen},
	journal={SciPost Phys.},
	volume={19},
	pages={055},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.19.2.055},
	url={https://scipost.org/10.21468/SciPostPhys.19.2.055},
}