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Anti-drude metal of bosons

Author

Listed:
  • Guido Masella

    (University of Strasbourg, CNRS, CESQ & ISIS (UMR 7006))

  • Nikolay V. Prokof’ev

    (University of Strasbourg, CNRS, CESQ & ISIS (UMR 7006)
    University of Massachusetts, Amherst)

  • Guido Pupillo

    (University of Strasbourg, CNRS, CESQ & ISIS (UMR 7006))

Abstract

In the absence of frustration, interacting bosons in their ground state in one or two dimensions exist either in the superfluid or insulating phases. Superfluidity corresponds to frictionless flow of the matter field, and in optical conductivity is revealed through a distinct δ-functional peak at zero frequency with the amplitude known as the Drude weight. This characteristic low-frequency feature is instead absent in insulating phases, defined by zero static optical conductivity. Here we demonstrate that bosonic particles in disordered one dimensional chains can also exist in a conducting, non-superfluid, phase when their hopping is of the dipolar type, often viewed as short-ranged in one dimension. This phase is characterized by finite static optical conductivity, followed by a broad anti-Drude peak at finite frequencies. Off-diagonal correlations are also unconventional: they feature an integrable algebraic decay for arbitrarily large values of disorder. These results do not fit the description of any known quantum phase, and strongly suggest the existence of an unusual conducting state of bosonic matter in the ground state.

Suggested Citation

  • Guido Masella & Nikolay V. Prokof’ev & Guido Pupillo, 2022. "Anti-drude metal of bosons," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29708-4
    DOI: 10.1038/s41467-022-29708-4
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    References listed on IDEAS

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