Dynamical Properties of Disordered Solids and Quantum Solidsat Low Temperatures

我们将研究猝灭无序固体中的低能集体激发，量子晶体中空位的运动，以及高极化费米液体中的输运。用核磁共振和热输运测量研究了N_2/碱金属固体混合物和NaCN/KCN混合晶体的取向玻璃态的低温驰豫。我们将检验猝灭无序系统中关联团簇生长动力学普适类的存在性。我们将用脉冲核磁共振研究接近熔化曲线的氦同位素固溶体中空位的量子隧穿。我们将研究简并开始对从固溶体中分离出来的高度极化的氦三滴相的自旋扩散和输运性质的影响。

Low-energy collective excitations in quenched disordered solids, the motion of vacancies in quantum crystals, and transport in highly polarized Fermi liquids will be studied. NMR and thermal transport measurements will be used to study low temperature relaxation in orientational glass states of N2/Alkali metal solid mixtures and NaCN/KCN mixed crystals. The existence of universality classes for the growth kinetics of correlated clusters in quenched disordered systems will be tested. Quantum tunneling of vacancies in isotopic helium solid solutions close to the melting curve will be studied with pulsed NMR. The effects of the onset of degeneracy on spin diffusion and transport properties of small, highly polarized helium-three droplets phase separated from solid solutions will be studied.