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Competing structures in two-dimensional trapped dipolar gases

We study a system of dipolar molecules confined in a two-dimensional trap and subject to an optical square lattice. The repulsive long-range dipolar interaction D/r super(3) favors an equilateral triangular arrangement of the molecules, which competes against the square symmetry of the underlying op...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-08, Vol.90 (6), Article 060101
Main Authors: Gränz, Barbara, Korshunov, Sergey E., Geshkenbein, Vadim B., Blatter, Gianni
Format: Article
Language:English
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Summary:We study a system of dipolar molecules confined in a two-dimensional trap and subject to an optical square lattice. The repulsive long-range dipolar interaction D/r super(3) favors an equilateral triangular arrangement of the molecules, which competes against the square symmetry of the underlying optical lattice with lattice constant b and amplitude V. We find the minimal-energy states at the commensurate density n = 1/b super(2) and establish the complete square-to-triangular transformation pathway of the lattice with decreasing V involving period-doubled, solitonic, and distorted-triangular configurations.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.060101