Haller, Elmar; Hart, Russell; Mark, Manfred; Danzl, Johann GIST Austria ; Reichsöllner, Lukas; Gustavsson, Mattias; Dalmonte, Marcello; Pupillo, Guido; Nägerl, Hanns
Quantum many-body systems can have phase transitions even at zero temperature; fluctuations arising from Heisenbergĝ€™s uncertainty principle, as opposed to thermal effects, drive the system from one phase to another. Typically, during the transition the relative strength of two competing terms in the systemĝ€™s Hamiltonian changes across a finite critical value. A well-known example is the Mottĝ€" Hubbard quantum phase transition from a superfluid to an insulating phase, which has been observed for weakly interacting bosonic atomic gases. However, for strongly interacting quantum systems confined to lower-dimensional geometry, a novel type of quantum phase transition may be induced and driven by an arbitrarily weak perturbation to the Hamiltonian. Here we observe such an effectĝ€"the sineĝ€"Gordon quantum phase transition from a superfluid Luttinger liquid to a Mott insulatorĝ€ "in a one-dimensional quantum gas of bosonic caesium atoms with tunable interactions. For sufficiently strong interactions, the transition is induced by adding an arbitrarily weak optical lattice commensurate with the atomic granularity, which leads to immediate pinning of the atoms. We map out the phase diagram and find that our measurements in the strongly interacting regime agree well with a quantum field description based on the exactly solvable sineĝ€"Gordon model. We trace the phase boundary all the way to the weakly interacting regime, where we find good agreement with the predictions of the one-dimensional Boseĝ€"Hubbard model. Our results open up the experimental study of quantum phase transitions, criticality and transport phenomena beyond Hubbard-type models in the context of ultracold gases.
We thank W. Zwerger for discussions. We are indebted to R. Grimm for generous support. We gratefully acknowledge funding by the Austrian Ministry of Science and Research (Bundesministerium für Wissenschaft und Forschung) and the Austrian Science Fund (Fonds zur Förderung der wissenschaftlichen Forschung) in the form of a START prize grant, and by the European Union through the STREP FP7-ICT-2007-C project NAME-QUAM (Nanodesigning of Atomic and Molecular Quantum Matter) and within the framework of the EuroQUASAR collective research project QuDeGPM. R.H. is supported by a Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme.
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Haller E, Hart R, Mark M, et al. Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons. Nature. 2010;466(7306):597-600. doi:10.1038/nature09259
Haller, E., Hart, R., Mark, M., Danzl, J. G., Reichsöllner, L., Gustavsson, M., … Nägerl, H. (2010). Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons. Nature. Nature Publishing Group. https://doi.org/10.1038/nature09259
Haller, Elmar, Russell Hart, Manfred Mark, Johann G Danzl, Lukas Reichsöllner, Mattias Gustavsson, Marcello Dalmonte, Guido Pupillo, and Hanns Nägerl. “Pinning Quantum Phase Transition for a Luttinger Liquid of Strongly Interacting Bosons.” Nature. Nature Publishing Group, 2010. https://doi.org/10.1038/nature09259.
E. Haller et al., “Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons,” Nature, vol. 466, no. 7306. Nature Publishing Group, pp. 597–600, 2010.
Haller E, Hart R, Mark M, Danzl JG, Reichsöllner L, Gustavsson M, Dalmonte M, Pupillo G, Nägerl H. 2010. Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons. Nature. 466(7306), 597–600.
Haller, Elmar, et al. “Pinning Quantum Phase Transition for a Luttinger Liquid of Strongly Interacting Bosons.” Nature, vol. 466, no. 7306, Nature Publishing Group, 2010, pp. 597–600, doi:10.1038/nature09259.