UPC webinar: "Spontaneous formation of Kagomé lattice in two-dimensional Rydberg atoms"

G. E. Astrakharchik


Apr 16, 2020 from 11:00 AM to 12:00 PM (Europe/Madrid / UTC200)


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“Spontaneous formation of Kagomé lattice in two-dimensional Rydberg atoms”


Two-dimensional Rydberg atoms are modeled at low temperatures by means of the classical Monte Carlo method. The Coulomb repulsion of charged ions competing with the repulsive van der Waals long-range tail is modeled by a number of interaction potentials. We find that under specific conditions the usual triangular crystal becomes unstable with respect to more exotic lattices such as Kagomé, flower, molecular crystal and rectangular chain packings. Ground-state configurations are obtained by means of the annealing procedure and their stability is additionally studied by the normal-mode analysis. While commonly the square lattice is mechanically unstable due to softening of the shear modulus, we were able to find a specific set of parameters for which the square lattice can be made stable.