The optical bleaching of the U band in potassium bromide crystals at 78°K has been investigated. The nature of the secondary bands, the U' and the Ul bands, was studied. The U' band consisted of component bands, including ...

In the second half of the dissertation, we investigate the problem of vortex trapping in cyclically coupled Bose-Josephson junctions. Starting with N independent BECs we couple the condensates through Josephson links and ...

This thesis describes the construction of an experimental apparatus to study disorder physics using ultracold fermionic atomic gases. We use this apparatus to realize 3D Anderson localization for the first time for quantum ...

Ultrasonic attenuation and velocity measurements were performed to probe the structure and annealing behavior of solute self interstitial complexes in electron irradiated (T < 70 K) dilute Al-Ag and Al-Si alloys. In ...

The mechanisms of interaction of ultrasonic waves with point defects in crystals are reviewed and a perturbation approach is introduced which leads to general expressions for the resonance and relaxation strengths in ...

The properties of trapped hydrogen tunneling systems in Nb and the analogous systems, H in Ta, and D in Nb have been studied with ultrasonic techniques at low temperature. Attenuation due to H in Ta was measured between ...

The ultrasonics studies undertaken in this work illustrate the applicability of ultrasonics to a broad variety of problems. In the case of Fe, the objective is to measure the production and annealing of the diaelastic ...

This works takes small steps towards the goal stated in the first paragraph. In the concluding chapter we discuss future directions for the development and application of these ideas.

In state-of-the-art storage applications such as hard disk drives, the intrinsic switching field distribution of the media grains is one of the most crucial properties defining the recording quality. However, this piece ...