Phase transition of ultracold atoms immersed in a Bose-Einstein-condensate vortex lattice
| Autor: | M. A. Caracanhas, R. H. Chaviguri, Vanderlei Salvador Bagnato, Tommaso Comparin |
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| Rok vydání: | 2017 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Phase transition Condensed matter physics Quantum Monte Carlo Quantum phases 01 natural sciences 010305 fluids & plasmas law.invention Vortex CONDENSADO DE BOSE-EINSTEIN law Ultracold atom Quantum mechanics 0103 physical sciences 010306 general physics Bose–Einstein condensate Quantum fluctuation Ansatz |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | We investigate the quantum phases of ultracold atoms trapped in a vortex lattice using a mixture of two bosonic species ($A$ and $B$), in the presence of an artificial gauge field. Heavy atoms of species $B$ are confined in the array of vortices generated in species $A$, and they are described through a Bose-Hubbard model. In contrast to the optical-lattice setups, the vortex lattice has an intrinsic dynamics, given by its Tkachenko modes. Including these quantum fluctuations in the effective model for $B$ atoms yields an extended Bose-Hubbard model, with an additional ``phonon'' -mediated long-range attraction. The ground-state phase diagram of this model is computed through a variational Ansatz and the quantum Monte Carlo technique. When compared with the ordinary Bose-Hubbard case, the long-range interatomic attraction causes a shift and resizing of the Mott-insulator regions. Finally, we discuss the experimental feasibility of the proposed scheme, which relies on the proper choice of the atomic species and on a large control of physical parameters, like the scattering lengths and the vorticity. |
| Databáze: | OpenAIRE |
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