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Phase separation in supersolids

Batrouni1, Scalettar

  • 1Institut Non-Lineaire de Nice, Universite de Nice-Sophia Antipolis, 1361 route des Lucioles, 06560 Valbonne, France.

Physical Review Letters
|October 4, 2000
PubMed
Summary
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The study reveals that the commonly believed "checkerboard" supersolid phase is unstable. A "striped" supersolid phase, however, is stable and distinct from the superfluid phase.

Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Systems

Background:

  • Investigating quantum phase transitions in two-dimensional hard-core boson Hubbard models.
  • Exploring the existence of supersolid phases exhibiting simultaneous diagonal and off-diagonal long-range order.

Purpose of the Study:

  • To numerically determine the thermodynamic stability of proposed supersolid phases.
  • To clarify the correct phase diagram of the hard-core boson Hubbard model.

Main Methods:

  • Numerical simulations of the two-dimensional hard-core boson Hubbard Hamiltonian.
  • Application of the Maxwell construction to obtain the equilibrium phase diagram.

Main Results:

  • The widely discussed "checkerboard" supersolid phase is found to be thermodynamically unstable.

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  • The

    • Conclusions:

    • The "striped" supersolid phase is thermodynamically stable.
    • A continuous phase transition separates the stable "striped" supersolid from the superfluid phase.