³He Dynamics in Quasi-1D Below the Fermi Degeneracy Temperature

We use NMR techniques to study the spin dynamics of ³He in quasi-1D confinement for temperatures well below the Fermi degeneracy temperature T_F. The quasi-1D channel was provided by MCM-41 mixed with ultra-fine silver powder and plated with a monolayer of ⁴He. The spin dynamics were measured using both low power pulsed and continuous wave NMR experiments. We explore the nuclear spin-lattice relaxation for temperatures 10 < T < 500mK. We observe one of the hallmarks of Luttinger liquid physics, a linear temperature dependence of the relaxation dynamic at very low temperatures, T < T_F. For T > T_F, the effect of transverse excitations reduced the relaxation times below the predicted T^-1/2 dependence for a one-dimensional Fermi system.