Localized Bose-Einstein condensation of 4He confined in nanoporous media

Keiya Shirahama, Keiichi Yamamoto, Yoshiyuki Shibayama

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15 Citations (Scopus)


4He confined in nanoporous media is an excellent model boson system in a confinement potential. We have studied the superfluid and thermodynamic properties of 4He confined in a porous glass that has nanopores of 2.5 nm diameter. It is shown that the confinement of 4He in nanopores produces a new quantum state, the localized Bose-Einstein condensation (LBEC) state, and markedly alters the pressuretemperature (P-T) phase diagram. In the LBEC state the global phase coherence is destroyed by strong atomic correlation or by the random potential of a substrate. The formation of LBEC leads to an anomalous reduction of the superfluid transition temperature T c, determined by the torsional oscillator technique, and the behavior of a quantum phase transition near 0 K. The contributions of roton and phonon excitations to the heat capacity provide definitive evidence of the LBEC state.

Original languageEnglish
Article number111011
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2008 Nov


  • Bose glass
  • Bose-Einstein condensation
  • He
  • Localization
  • Quantum phase transition
  • Superfluidity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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