Exploring quantum criticality based on ultracold atoms in optical lattices

Xibo Zhang, Chen Lung Hung, Shih Kuang Tung, Nathan Gemelke, Cheng Chin

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Critical behavior developed near a quantum phase transition, interesting in its own right, offers exciting opportunities to explore the universality of strongly correlated systems near the ground state. Cold atoms in optical lattices, in particular, represent a paradigmatic system, for which the quantum phase transition between the superfluid and Mott insulator states can be externally induced by tuning the microscopic parameters. In this paper, we describe our approach to study quantum criticality of cesium atoms in a twodimensional (2D) lattice based on in situ density measurements. Our research agenda involves testing critical scaling of thermodynamic observables and extracting transport properties in the quantum critical regime. We present and discuss experimental progress on both fronts. In particular, the thermodynamic measurement suggests that the equation of state near the critical point follows the predicted scaling law at low temperatures.

Original languageEnglish (US)
Article number045011
JournalNew Journal of Physics
Volume13
DOIs
StatePublished - Apr 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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