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Q: Fachverband Quantenoptik und Photonik

Q 21: Quantengase: Optische Gitter 1

Q 21.1: Vortrag

Dienstag, 13. März 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.