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• W2462644557 endingPage "073018" @default.
• W2462644557 startingPage "073018" @default.
• W2462644557 abstract "Advances with trapped ultracold atoms intensified interest in simulating complex physical phenomena, including quantum magnetism and transitions from itinerant to non-itinerant behavior. Here we show formation of antiferromagnetic ground states of few ultracold fermionic atoms in single and double well (DW) traps, through microscopic Hamiltonian exact diagonalization for two DW arrangements: (i) two linearly oriented one-dimensional, 1D, wells, and (ii) two coupled parallel wells, forming a trap of two-dimensional, 2D, nature. The spectra and spin-resolved conditional probabilities reveal for both cases, under strong repulsion, atomic spatial localization at extemporaneously created sites, forming quantum molecular magnetic structures with non-itinerant character. These findings usher future theoretical and experimental explorations into the highly-correlated behavior of ultracold strongly-repelling fermionic atoms in higher dimensions, beyond the fermionization physics that is strictly applicable only in the 1D case. The results for four atoms are well described with finite Heisenberg spin-chain and cluster models. The numerical simulations of three fermionic atoms in symmetric double wells reveal the emergent appearance of coupled resonating 2D Heisenberg clusters, whose emulation requires the use of a t-J-like model, akin to that used in investigations of high T$_c$ superconductivity. The highly entangled states discovered in the microscopic and model calculations of controllably detuned, asymmetric, double wells suggest three-cold-atom DW quantum computing qubits." @default.
• W2462644557 created "2016-07-22" @default.
• W2462644557 creator A5015838896 @default.
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• W2462644557 date "2016-07-08" @default.
• W2462644557 modified "2023-10-06" @default.
• W2462644557 title "Ultracold few fermionic atoms in needle-shaped double wells: spin chains and resonating spin clusters from microscopic Hamiltonians emulated via antiferromagnetic Heisenberg and<i>t</i>–<i>J</i>models" @default.
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• W2462644557 doi "https://doi.org/10.1088/1367-2630/18/7/073018" @default.
• W2462644557 hasPublicationYear "2016" @default.
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