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Dr. Yuli Lyanda-Geller - General Colloquium
October 30, 2003
Dr. Yuli Lyanda-Geller
Naval Research Laboratory
Title: Geometric phases and their roles in physics
It has long been appreciated that magnetic fields, through the Aharonov-Bohm effect, provide an exquisite probe of quantum intereference phenomena. A notable example is provided by conductance oscillations in mesoscopic rings. More recently, it has been recognized that interference phenomena in mesoscopic systems can also be probed via other sources of quantal phase, notably Berry's quantal geometric phase. The geometric phase plays remarkable role in spin physics on nanoscale. It can also provide fascinating probes of magnetism andunconventional superconductivity and superfluidity. In this talk, I shall discuss a selection of roles played by the geometric phase in a variety of mesoscopic settings, and also in the broader physics context.