Abstract
A fluid monolayer of 3He adsorbed on a graphite surface is an ideal twodimensional (2D) Fermi system. We have observed very large mass enhancement of the quasiparticles (m*/m=20±5) in preliminary heat-capacity measurements for high density 3He fluids adsorbed on graphite preplated with a 4He monolayer (3He/4He/gr). This could be divergence of m* toward the critical density for the 4/7 phase with a triangular lattice, which is a registered phase commensurate against the first layer. The observed m* is larger than those reported for other 2D 3He systems, e.g., m*/m=13 for 3He/HD/HD/gr system, presumably because of the higher critical density. The apparent divergence of m* toward the different Critical densities strongly suggests the Mott–Hubbard type transition between the 2D Fermi fluid phase and the registered phase under a strong onsite hard core repulsion between the 3He atoms.
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Tsuji, D., Matsumoto, Y., Murakawa, S. et al. Large Mass Enhancement in 3He Monolayer Fluids Adsorbed on Graphite Preplated with 4He. Journal of Low Temperature Physics 134, 31–36 (2004). https://doi.org/10.1023/B:JOLT.0000012530.31728.09
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DOI: https://doi.org/10.1023/B:JOLT.0000012530.31728.09