Elastic anomaly of helium films at a quantum phase transition

T. Makiuchi, M. Tagai, Y. Nago, D. Takahashi, K. Shirahama

研究成果: Article査読

6 被引用数 (Scopus)

抄録

Helium films show various quantum phases that undergo quantum phase transitions by changing coverage n. We found anomalous elastic phenomena in bosonic He4 and fermionic He3 films adsorbed on a glass substrate. The films stiffen under ac strain at low temperature with an excess dissipation. The onset temperature of the stiffening decreases to 0 K as n approaches a critical coverage nc. The elastic anomaly is explained by thermal activation of helium atoms from the localized to extended states with a distributed energy gap. We determine the energy band structure of helium films from elasticity. The ground states of He4 and He3 at n<nc, which are possibly a sort of Mott insulator or Mott glass, are identically gapped and compressible.

本文言語English
論文番号235104
ジャーナルPhysical Review B
98
23
DOI
出版ステータスPublished - 2018 12 3

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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