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Realization of a Bosonic Antiferromagnet

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arxiv 2009.01426 v2 pith:WNCG6SYC submitted 2020-09-03 cond-mat.quant-gas physics.atom-phquant-ph

Realization of a Bosonic Antiferromagnet

classification cond-mat.quant-gas physics.atom-phquant-ph
keywords antiferromagnetbosonicspincondensedheisenbergmattersystemultracold
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Quantum antiferromagnets are of broad interest in condensed matter physics as they provide a platform for studying exotic many-body states including spin liquids and high-temperature superconductors. Here, we report on the creation of a one-dimensional Heisenberg antiferromagnet with ultracold bosons. In a two-component Bose-Hubbard system, we switch the sign of the spin-exchange interaction and realize the isotropic antiferromagnetic Heisenberg model in an extended 70-site chain. Starting from a low-entropy N\'eel-ordered state, we use optimized adiabatic passage to approach the bosonic antiferromagnet. We demonstrate the establishment of antiferromagnetism by probing the evolution of the staggered magnetization and spin correlations of the system. Compared with condensed matter systems, ultracold gases in optical lattices can be microscopically engineered and measured, offering significant advantages for exploring bosonic magnetism and spin dynamics.

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