What is Minimal Model of 3He Adsorbed on Graphite? -Importance of Density Fluctuations in 4/7 Registered Solid -

Abstract

We show theoretically that the second layer of 3He adsorbed on graphite and solidified at 4/7 of the first-layer density is close to the fluid-solid boundary with substantial density fluctuations on the third layer. The solid shows a translational symmetry breaking as in charge-ordered insulators of electronic systems. We construct a minimal model beyond the multiple-exchange Heisenberg model. An unexpectedly large magnetic field required for the measured saturation of magnetization is well explained by the density fluctuations. The emergence of quantum spin liquid is understood from the same mechanism as in the Hubbard model and in κ-(ET)_2Cu_2(CN)_3 near the Mott transitions.

9 pages, 5 figures

References in corpus (3)

• Gapless quantum spin liquid, stripe and antiferromagnetic phases in frustrated Hubbard models in two dimensions
• Exact diagonalization study of Mott transition in the Hubbard model on an anisotropic triangular lattice
• Absence of Translational Symmetry Breaking in Nonmagnetic Insulator Phase on Two-Dimensional Lattice with Geometrical Frustration

Cited by in corpus (3)

• Phase Diagram of the Triangular t-J Model with Multiple Spin Exchange in the Doped-Mott Region
• Spin and density excitations in the triangular-lattice $t$-$J$ model with multiple-spin exchange interactions: ${}^3$He on graphite
• On Proximity of 4/7 Solid Phase of 3He Adsorbed on Graphite -Origin of Specific-Heat Anomalies in Hole-Doped Density-Ordered Solid-