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Spring 2023

Nguyen, Phong

The main theme of this thesis is the superfluid transition in reduced dimensions and in anisotropic and inhomogeneous systems. Using state-of-the-art computational methodology, we carry out large-scale, numerically exact computer simulations to study this topic, making use of classical and...

Fall 2015

Idowu, Saheed A

We study by computer simulations the low temperature properties of small parahydrogen clusters (free clusters) and the effect of confinement on the energetics and superfluid properties in two-dimensions (2D). Computed energetics for the free clusters are in quantitative agreement with that...

Spring 2011

Rabbani, Arif

Torsional oscillator experiments on solid 4He show supersolid behavior which appears to be associated with disorder. However, confining helium in the pores of an aerogel does not enhance the supersolid decoupling, even though x-ray measurements confirm that the crystals are highly disordered. ...

Fall 2014

Omiyinka, Tokunbo P

Confinement is known to suppress order in condensed matter. This is well exemplified in phase transitions such as freezing, as well as the superfluid transition in liquid helium, which occur at lower temperatures in confinement than in the bulk. We provide in this thesis a demonstration of a...

Fall 2010

Dang, Long

The main theme of this thesis is the interplay between superfluidity and localization, in a system of strongly correlated Bose particles. Driving this investigation is the search for yet unobserved phases of matter, such as the so-called supersolid. Using state-of-the- art, numerically exact...

Fall 2024

Yu, Sam

We study the ground state physics of a helium-4 monolayer adsorbed onto graphene substrate through means of quantum Monte Carlo simulations. At low temperatures, helium-4 is well-known to undergo a superfluid transition. In the presence of a modulating potential from corrugated substrates like...