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Ground State and Excitation Properties of Soft-Core Bosons

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Abstract

We study the physics of soft-core bosons at zero temperature in two dimensions for a class of potentials that could be realised in experiments with Rydberg dressed Bose-Einstein condensates. We analyze the ground state properties of the system in detail and provide a complete description of the excitation spectra in both superfluid, supersolid and crystalline phase for a wide range of interaction strengths and densities. In addition we describe a method to extract the transverse gapless excitation modes in the phases with broken translational symmetry within the framework of path integral Monte Carlo methods.

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Acknowledgments

We acknowledge M. Boninsegni, G. Carleo, S. Moroni, and T. Pohl for valuable discussions.

Author information

Author notes

  1. Tommaso Macrì

    Present address: QSTAR, Largo Enrico Fermi 2, 50125 , Firenze, Italy

Authors and Affiliations

  1. Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 , Dresden, Germany

    Tommaso Macrì

  2. Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 , Garching, Germany

    Tommaso Macrì

  3. SISSA Scuola Internazionale Superiore di Studi Avanzati and DEMOCRITOS National Simulation Center, Istituto Officina dei Materiali del CNR, Via Bonomea 265, 34136 , Trieste, Italy

    Sebastiano Saccani

  4. National Institute for Theoretical Physics (NITheP), Stellenbosch , 7600, South Africa

    Fabio Cinti

  5. Institute of Theoretical Physics, University of Stellenbosch, Stellenbosch , 7600, South Africa

    Fabio Cinti

Authors
  1. Tommaso Macrì
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  2. Sebastiano Saccani
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  3. Fabio Cinti
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Correspondence to Tommaso Macrì.

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Macrì, T., Saccani, S. & Cinti, F. Ground State and Excitation Properties of Soft-Core Bosons. J Low Temp Phys 177, 59–71 (2014). https://doi.org/10.1007/s10909-014-1192-7

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  • DOI: https://doi.org/10.1007/s10909-014-1192-7

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