Dynamical Superfluid and Bose-Insulator Phases in Quantized Polariton Lattices

Sanjib Ghosh

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arXiv · 2603.03600

Dynamical Superfluid and Bose-Insulator Phases in Quantized Polariton Lattices

Sanjib Ghosh

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Abstract

We demonstrate that Hilbert-space quantization in polariton lattices-manifested as multiple quantized energy levels in strongly confined sites-provides an unconventional route to realizing and manipulating different quantum phases. We show that nonlinear interactions transfer population into excited on-site quantum levels, which acts as an intrinsic dynamical channel controlling quantum coherence across the lattice. While weak nonlinearity confines polaritons to the lowest mode, yielding a robust superfluid phase with broken U(1) symmetry, strong nonlinearity induces phase diffusion through inter-level mixing. This dynamically generated fluctuations suppress global phase coherence and drives the system into a dynamical Bose-insulating phase. The changes between these phases occurs either as a nonequilibrium phase transition or a sharp crossover.

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Sanjib Ghosh. 2026-03-04. Dynamical Superfluid and Bose-Insulator Phases in Quantized Polariton Lattices. https://arxiv.org/abs/2603.03600

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