Quantum critical behavior in chains of hindered dipolar planar rotors
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Updated: Nov 6, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Wenxue Zhang1, Muhammad Shaeer Moeed2,3,4, Estevao De Oliveira2
1Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
Abstract:
We study the ground-state properties of linear chains of dipolar planar rotors hindered by a sixfold on-site potential, a model motivated by water molecules confined in the hexagonal cavities of beryl. Using density matrix renormalization group calculations, we locate the quantum phase transition between the disordered and ferroelectrically ordered phases using the von Neumann entanglement entropy and the Binder ratio of the polarization. A sweep of the sixfold pinning strength shows that increasing hindrance shifts the critical dipolar coupling gc to smaller values. These results suggest that crystal-field hindrance can promote, rather than suppress, dipolar ordering. This work has implications for ferroelectricity and quantum-device tuning in confined molecular rotors.
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