Universal properties of anisotropic dipolar bosons in two dimensions

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Sánchez-Baena, J.; Peña Ardila, L.; Astrakharchik, G.; Mazzanti, F.: Universal properties of anisotropic dipolar bosons in two dimensions. In: SciPost Physics 13 (2022), Nr. 2, 031. DOI: https://doi.org/10.21468/scipostphys.13.2.031

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The energy of ultra-dilute quantum many-body systems is known to exhibit a universal dependence on the gas parameter x = nad0, with n the density, d the dimensionality of the space (d = 1,2,3) and a0 the s-wave scattering length. The universal regime typically extends up to x ≈ 0.001, while at larger values specific details of the interaction start to be relevant and different model potentials lead to different results. Dipolar systems are peculiar in this regard since the anisotropy of the interaction makes a0 depend on the polarization angle α, so different combinations of n and α can lead to the same value of the gas parameter x. In this work we analyze the scaling properties of dipolar bosons in two dimensions as a function of the density and polarization dependent scattering length up to very large gas parameter values. Using Quantum Monte Carlo (QMC) methods we study the energy and the main structural and coherence properties of the ground state of a gas of dipolar bosons by varying the density and scattering length for a fixed gas parameter. We find that the dipolar interaction shows relevant scaling laws up to unusually large values of x that hold almost to the boundaries in the phase diagram where a transition to a stripe phase takes place.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2022
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of United States United States 10 45.45%
2 image of flag of France France 6 27.27%
3 image of flag of Germany Germany 3 13.64%
4 image of flag of China China 2 9.09%
5 image of flag of Europe Europe 1 4.55%

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