Quantum dynamics in Fermi and Bose commensurate Helium bilayers
The strongly correlated commensurate phases of helium adsorbed on graphite offer the opportunity to investigate the dynamics of almost-localized quantum many-body systems. In particular, the 4/7 phase of the 3He helium bilayer displays remarkable properties: a quantum frustrated spin-liquid ground state has been observed in fermionic 3He, where detailed heat capacity and NMR investigations have been performed. In addition, a supersolid ground state has been predicted for bosonic 4He. However, the actual structure and the excitation spectrum of these systems are still unknown. Here we propose to measure the dispersion relation of the elementary lattice excitations of the pure 4He and 3He 4/7 phases as well as the neighbouring vacancy-doped coverages. The results on these systems is of current theoretical interest in the field of quantum fluids and solids, correlated fermions and high Tc superconductors and ultra-cold atoms.
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GODFRIN Henri; COLLIN Eddy; FAK Bjorn; LAUTER Hans; OLLIVIER Jacques and SULTAN Ahmad. (2013). Quantum dynamics in Fermi and Bose commensurate Helium bilayers. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-01-327
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