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Physical Review Letters

Helium Atoms in Zeolite Cages: Novel Mott-Hubbard and Bose-Hubbard Systems

B. Y. Chen, S. D. Mahanti, M. Yussouff

Published Jul 17, 1995• 56 citations
Publisher

Abstract

Low-lying excitations of ${}^{4}$He and ${}^{3}$He atoms confined inside zeolite cages have been modeled by Bose-Hubbard and Mott-Hubbard rings with strong intrasite repulsion and finite intersite attraction. Differences between ${}^{4}$He and ${}^{3}$He arise due to mass and the statistics. Calculated temperature and concentration dependences of the heat capacity agree qualitatively with the experiment, but a quantitative comparison suggests that disorder may dominate at very low $T$.

DOI
10.1103/physrevlett.75.473

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Low-lying excitations of 4{}^{4}4He and 3{}^{3}3He atoms confined inside zeolite cages have been modeled by Bose-Hubbard and Mott-Hubbard rings with strong intrasite repulsion and finite intersite attraction. Differences between 4{}^{4}4He and 3{}^{3}3He arise due to mass and the statistics. Calculated temperature and concentration dependences of the heat capacity agree qualitatively with the experiment, but a quantitative comparison suggests that disorder may dominate at very low TTT.
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