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Journal of the Physical Society of Japan

Localized Bose-Einstein Condensation of ^4He Confined in Nanoporous Media( New Frontiers of Quantum Fluids and Solids)

Keiya Shirahama, Keiichi Yamamoto, Yoshiyuki Shibayama

Published Nov 15, 2008• 0 citations
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Localized Bose–Einstein Condensation of4He Confined in Nanoporous Media

Keiya Shirahama, Keiichi Yamamoto, Yoshiyuki Shibayama

4 He confined in nanoporous media is an excellent model boson system in a confinement potential. We have studied the superfluid and thermodynamic properties of 4 He confined in a porous glass that has nanopores of 2.5 nm diameter. It is shown that the confinement of 4 He in nanopores produces a new quantum state, the localized Bose–Einstein condensation (LBEC) state, and markedly alters the pressure–temperature ( 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.

Journal of the Physical Society of Japan•Nov 10, 2008•20 citations
4 He confined in nanoporous media is an excellent model boson system in a confinement potential. We have studied the superfluid and thermodynamic properties of 4 He confined in a porous glass that has nanopores of 2.5 nm diameter. It is shown that the confinement of 4 He in nanopores produces a new quantum state, the localized Bose–Einstein condensation (LBEC) state, and markedly alters the pressure–temperature ( 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.