Static structure factor of two-dimensional liquid 3He adsorbed on graphite

Ahmad Sultan (1) , Matthias Meschke (2) , Hans J. Lauter (3) , Henri Godfrin (1)

1 NEEL - UBT - Ultra-basses températures
2 Aalto - Aalto university low temperature physics
3 ILL - Institut Laue-Langevin

Liquid 3He is a model system for strongly correlated Fermi liquids. For this reason, many X-ray and neutron scattering experiments have been performed to understand the structure and dynamics of this quantum fluid. We have recently shown that two-dimensional liquid 3He sustains long-lived zero-sound excitations at large wave-vectors (Nature 483, 576, 2012). Here we show that its static structure factor can be obtained with reasonable accuracy by integrating the experimental S(Q,ω) over a suitable energy range. A good agreement is found between the static structure factor deduced from the experiment and theoretical models: Quantum Monte Carlo simulations and Dynamical Many Body Theory (DMBT). At high wave-vectors, the experimental values are underestimated because of the limited accessible phase space; nevertheless, even at atomic wave-vectors a semiquantitative agreement is observed with the theoretical predictions.

Mots clés: Helium three; Fermi liquids; Two-dimensional quantum fluids; Structure factor

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Ahmad Sultan, Matthias Meschke, Hans J. Lauter, Henri Godfrin. Static structure factor of two-dimensional liquid 3He adsorbed on graphite. Journal of Low Temperature Physics, 2012, 169, pp.367. ⟨10.1007/s10909-012-0649-9⟩. ⟨hal-00920426⟩