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Thomas Pohl

Observation of spatially ordered structures in a two-dimensional Rydberg gas

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  • Peter Schauss, Max Planck Inst Astron, Max Planck Society
  • ,
  • Marc Cheneau, Max Planck Inst Astron, Max Planck Society
  • ,
  • Manuel Endres, Max Planck Inst Astron, Max Planck Society
  • ,
  • Takeshi Fukuhara, Max Planck Inst Astron, Max Planck Society
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  • Sebastian Hild, Max Planck Inst Astron, Max Planck Society
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  • Ahmed Omran, Max Planck Inst Astron, Max Planck Society
  • ,
  • Thomas Pohl
  • Christian Gross, Max Planck Inst Astron, Max Planck Society
  • ,
  • Stefan Kuhr, University of Strathclyde
  • ,
  • Immanuel Bloch, Munich University

The ability to control and tune interactions in ultracold atomic gases has paved the way for the realization of new phases of matter. So far, experiments have achieved a high degree of control over short-range interactions, but the realization of long-range interactions has become a central focus of research because it would open up a new realm of many-body physics. Rydberg atoms are highly suited to this goal because the van der Waals forces between them are many orders of magnitude larger than those between ground-state atoms(1). Consequently, mere laser excitation of ultracold gases can cause strongly correlated many-body states to emerge directly when atoms are transferred to Rydberg states. A key example is a quantum crystal composed of coherent superpositions of different, spatially ordered configurations of collective excitations(2-5). Here we use high-resolution, in situ Rydberg atom imaging to measure directly strong correlations in a laser-excited, two-dimensional atomic Mott insulator(6). The observations reveal the emergence of spatially ordered excitation patterns with random orientation, but well-defined geometry, in the high-density components of the prepared many-body state. Together with a time-resolved analysis, this supports the description of the system in terms of a correlated quantum state of collective excitations delocalized throughout the gas. Our experiment demonstrates the potential of Rydberg gases to realize exotic phases of matter, thereby laying the basis for quantum simulations of quantum magnets with long-range interactions.

Original languageEnglish
JournalNature Genetics
Pages (from-to)87-91
Number of pages5
Publication statusPublished - 1 Nov 2012
Externally publishedYes

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