Short-Range Quantum Magnetism of Ultracold Fermions in an Optical Lattice
| Autor: | Leticia Tarruell, Tilman Esslinger, Daniel Greif, Thomas Uehlinger, Gregor Jotzu |
|---|---|
| Přispěvatelé: | Institute for Quantum Electronics, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), lp2n-03,lp2n-11, Laboratoire Photonique, Numérique et Nanosciences (LP2N), Université Sciences et Technologies - Bordeaux 1-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
[PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas]
Magnetism Quantum simulator FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Particle in a one-dimensional lattice Condensed Matter - Strongly Correlated Electrons [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph] 0103 physical sciences Antiferromagnetism 010306 general physics Physics Condensed Matter::Quantum Gases Optical lattice Quantum Physics Multidisciplinary Condensed matter physics Spins Strongly Correlated Electrons (cond-mat.str-el) Exchange interaction Quantum Gases (cond-mat.quant-gas) Condensed Matter::Strongly Correlated Electrons Fermi gas Condensed Matter - Quantum Gases Quantum Physics (quant-ph) |
| Zdroj: | Science SCIENCE Science, American Association for the Advancement of Science, 2013, 340 (6138), pp.1307-1310. ⟨10.1126/science.1236362⟩ |
| ISSN: | 0036-8075 1095-9203 |
| DOI: | 10.1126/science.1236362 |
| Popis: | The exchange coupling between quantum mechanical spins lies at the origin of quantum magnetism. We report on the observation of nearest-neighbor magnetic spin correlations emerging in the many-body state of a thermalized Fermi gas in an optical lattice. The key to obtaining short-range magnetic order is a local redistribution of entropy within the lattice structure. This is achieved in a tunable-geometry optical lattice, which also enables the detection of the magnetic correlations. We load a low-temperature two-component Fermi gas with repulsive interactions into either a dimerized or an anisotropic simple cubic lattice. For both systems the correlations manifest as an excess number of singlets as compared to triplets consisting of two atoms with opposite spins. For the anisotropic lattice, we determine the transverse spin correlator from the singlet-triplet imbalance and observe antiferromagnetic correlations along one spatial axis. Our work paves the way for addressing open problems in quantum magnetism using ultracold fermions in optical lattices as quantum simulators. Comment: 10 pages, 9 figures |
| Databáze: | OpenAIRE |
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