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Graduate Student Seminar - 02/13/2015

"The Casimir Force and Electrostatic Patch Potentials"

by Joseph Garrett

Friday, February 13, 2015 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Assistant Professor Jeremy Munday

Electromagnetic fluctuations cause a force, known as the Casimir force, between solid surfaces. In the last two decades, several experiments measured the Casimir force with increasing precision, but the results were unexpected: the raw data agree better with the calculated force if vanishing low-frequency resistance is assumed (contrary to experience with room-temperature metals). To address these anomalous results, several sources of systematic error have been identified: roughness, distance offsets, and patch potentials. In this talk, I will discuss the implications of our recent measurement of patch potentials on gold surfaces (with Kelvin probe force microscopy) to the measurement of the Casimir force.

For additional information about the IREAP Graduate Student Seminars, contact Joe Garrett, David Somers or Joe Murray.

Return to the Graduate Student Seminars schedule.