Bose-Einstein condensation in exotic lattice geometries

• URL: http://arxiv.org/abs/2505.16885v1
• Date: Thu, 22 May 2025 16:40:22 GMT
• Title: Bose-Einstein condensation in exotic lattice geometries
• Authors: Kamil Dutkiewicz, Marcin Płodzień, Abel Rojo-Francàs, Bruno Juliá-Díaz, Maciej Lewenstein, Tobias Grass,
• Abstract summary: Modern quantum engineering techniques allow for synthesizing quantum systems in exotic lattice geometries.<n>We demonstrate that these structures profoundly reshape Bose-Einstein condensation.<n>Our findings establish lattice geometry as a powerful tuning knob for quantum phase phenomena.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Modern quantum engineering techniques allow for synthesizing quantum systems in exotic lattice geometries, from self-similar fractal networks to negatively curved hyperbolic graphs. We demonstrate that these structures profoundly reshape Bose-Einstein condensation. Fractal lattices dramatically lower the condensation temperature, while hyperbolic lattices cause it to increase as the system grows - a behavior not seen in ordinary two-dimensional arrays, where the condensation temperature vanishes in the large-size limit. The underlying geometry also controls condensate fluctuations, enhancing them on fractal networks but suppressing them on hyperbolic graphs compared with regular one-dimensional or two-dimensional lattices. When strong repulsive interactions are included, the gas enters a Mott insulating state. A multi-site Gutzwiller approach finds a smooth interpolation between the characteristic insulating lobes of one-dimensional and two-dimensional systems. Re-entrant Mott transitions are seen within a first-order resummed hopping expansion. Our findings establish lattice geometry as a powerful tuning knob for quantum phase phenomena and pave the way for experimental exploration in photonic waveguide arrays and Rydberg-atom tweezer arrays.

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