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

Keiya Shirahama, Keiichi Yamamoto, Yoshiyuki Shibayama

研究成果: Article査読

15 被引用数 (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.

ジャーナルJournal of the Physical Society of Japan
出版ステータスPublished - 2008 11月

ASJC Scopus subject areas

  • 物理学および天文学(全般)


「Localized Bose-Einstein condensation of 4He confined in nanoporous media」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。