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Low Temperature Electron-Phonon Interaction



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Low Temperature Electron Phonon Interaction in Disordered Metal Thin Films and Applications to Fast Sensitive Sub Millimeter Photon Sources and Detectors A Dissertation Presented to the Faculty of the Graduate School of Yale University in Candidacy for the Degree of Doctor of Philosophy by Minghao Shen Dissertation Director Robert Schoelkopf December 2005 c 2005 by Minghao Shen All rights reserved Abstract Low Temperature Electron Phonon Interaction in Disordered Metal Thin Films and Applications to Fast Sensitive Sub Millimeter Photon Sources and Detectors Minghao Shen May 2005 The electron phonon interaction in metals becomes very weak at very low temperatures sub Kelvin temperatures It is very challenging to measure such weak interaction with traditional techniques In this thesis work we develop a new dynamic microwave noise thermometry technique for study the low temperature electron phonon interaction in disordered metal thin films The high sensitivity and fast time response of the thermometry allow us to study the electron phonon interaction in nano scale disordered metal thin films Both long diffusive metal wires and short wires in SNS structures are observed We measure the electron phonon heat conductance Ge ph in steady states and the electron phonon time e ph and electronic heat capacity Ce from the electron thermal dynamic in the time domain The results of the three quantities are consistent within themselves for each device and can be explained qualitatively by the theory Sergeev Mitin 2000 However the measured values for Ge ph and Ce are 10 50 times larger than the expected book values We also develop a new on chip calibration scheme for ultra sensitive submillimeter detectors with phonon cooled hot electron sources The sources are essentially metal thin films whose hot electron induced Johnson noise is equivalent to one dimensional blackbody radiation The weak electron phonon interaction in the film makes the source very accurate and fast at low



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