Observation of correlated particle-hole pairs and string order in low-dimensional Mott insulators.
نویسندگان
چکیده
Quantum phases of matter are characterized by the underlying correlations of the many-body system. Although this is typically captured by a local order parameter, it has been shown that a broad class of many-body systems possesses a hidden nonlocal order. In the case of bosonic Mott insulators, the ground state properties are governed by quantum fluctuations in the form of correlated particle-hole pairs that lead to the emergence of a nonlocal string order in one dimension. By using high-resolution imaging of low-dimensional quantum gases in an optical lattice, we directly detect these pairs with single-site and single-particle sensitivity and observe string order in the one-dimensional case.
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ورودعنوان ژورنال:
- Science
دوره 334 6053 شماره
صفحات -
تاریخ انتشار 2011