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Siu-Tat Chui

Title: Office: Phone: email: Web:

Professor 250 Sharp Lab (302) 831-8115 chui@bartol.udel.edu http://www.bartol.udel.edu/~chui

Fields of Research

Dr. Chui obtained his Ph.D. in physics from Princeton University in 1972. He was an instructor at Princeton from 1972 to 1973, a member of the Technical Staff at Bell Laboratories from 1973 to 1975, and Assistant Professor at SUNY-Albany from 1975 to 1979. He joined the Bartol Research Institute in 1979.

Dr. Chui is a condensed matter theorist. His main interests are in the areas of magnetism, phase transition and critical phenomena, and electron-electron correlation effects. In the area of phase transitions, he first developed a duality transformation that maps a field theory from the strong to the weak coupling limit. He clarified both the dynamic and static properties of the roughening transition. This seminal work is among the first of the recent interests in the properties of interfaces. He elucidated the nature of classical melting in two dimensions via a mechanism of grain boundary generation and resolved the discrepancy between experimental results and previous theoretical calculations. In the area of electron correlation effects, he predicted the occurrence of a Hall plateau for a one-dimensional electron system in a magnetic field near half filling due to a novel many-body electron state. This effect was recently observed experimentally. He first recognized the importance of the strong interplay between electron-electron interaction and impurities effects in one-dimensional systems and solved this problem in the Tomonaga-Luttinger model. He worked on the quantum melting of electrons at interfaces and flux lines and elucidated its connection to the dislocation mechanism of melting.

More recently he has co-developed a viable high temperature permanent magnet, discovered a new small magnetic structure that can be an order of magnitude more sensitive than current hard disk sensors, and propose a phenomena of quantum spinodial decomposition to explain phase segregation in Bose-Einstein condensed alkali atoms.