Elastic anomaly of helium films at a quantum phase transition

T. Makiuchi, M. Tagai, Yusuke Nago, D. Takahashi, Keiya Shirahama

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number235104
JournalPhysical Review B
Volume98
Issue number23
DOIs
Publication statusPublished - 2018 Dec 3

Fingerprint

helium film
Helium
Phase transitions
anomalies
stiffening
glass
helium atoms
Band structure
energy bands
dissipation
elastic properties
insulators
activation
Glass
ground state
Ground state
Elasticity
Energy gap
Chemical activation
Atoms

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Elastic anomaly of helium films at a quantum phase transition. / Makiuchi, T.; Tagai, M.; Nago, Yusuke; Takahashi, D.; Shirahama, Keiya.

In: Physical Review B, Vol. 98, No. 23, 235104, 03.12.2018.

Research output: Contribution to journalArticle

Makiuchi, T. ; Tagai, M. ; Nago, Yusuke ; Takahashi, D. ; Shirahama, Keiya. / Elastic anomaly of helium films at a quantum phase transition. In: Physical Review B. 2018 ; Vol. 98, No. 23.
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