Journal of Low Temperature Physics

, Volume 177, Issue 1–2, pp 59–71 | Cite as

Ground State and Excitation Properties of Soft-Core Bosons

Article

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.

Keywords

Soft-core bosons Rydberg atoms Elementary excitations  Path integral Quantum Monte Carlo 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Tommaso Macrì
    • 1
    • 2
    • 3
  • Sebastiano Saccani
    • 4
  • Fabio Cinti
    • 5
    • 6
  1. 1.Max Planck Institute for the Physics of Complex SystemsDresdenGermany
  2. 2.Max-Planck-Institut für QuantenoptikGarchingGermany
  3. 3.QSTARFirenzeItaly
  4. 4.SISSA Scuola Internazionale Superiore di Studi Avanzati and DEMOCRITOS National Simulation CenterIstituto Officina dei Materiali del CNRTriesteItaly
  5. 5.National Institute for Theoretical Physics (NITheP)Stellenbosch South Africa
  6. 6.Institute of Theoretical PhysicsUniversity of StellenboschStellenbosch South Africa

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