Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Quantengase: Optische Gitter 1
Q 21.1: Talk
Tuesday, March 13, 2012, 10:30–10:45, V53.01
Observation of Correlated Particle-Hole Pairs and String Order in Low-Dimensional Mott Insulators — •Manuel Endres1, Marc Cheneau1, Takeshi Fukuhara1, Christof Weitenberg1, Peter Schauß1, Christian Gross1, Leonardo Mazza1, Mari Carmen Banuls1, Lode Pollet2, Immanuel Bloch1, and Stefan Kuhr3 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Theoretische Physik, ETH Zurich — 3University of Strathclyde, SUPA, Glasgow
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 non-local 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 non-local string order in one dimension. 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.