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(UMI)AAI9011014 Van Harlingen, Dale J. Sharifi, Fred 2011-05-07T14:29:26Z 2011-05-07T14:29:26Z 10000-01-01 1989 This thesis is a study of escape from metastable wells in one and two dimensional potentials of superconducting devices. We have measured escape rates due to both thermal activation over the barrier and macroscopic quantum tunneling through the barrier. The measurements were performed for a variety of device parameters, corresponding to different shapes of the potential barrier. We find strong evidence for macroscopic quantum tunneling in both one and two dimensional systems with an escape rate that is very sensitive to the dissipation present in the system. Surprisingly, we have also found a discrepancy between our results and the predictions of Kramers' thermal activation model in certain types of potentials. Made available in DSpace on 2011-05-07T14:29:26Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9011014.pdf: 2917585 bytes, checksum: 9986dd956267fd47310190005e04e292 (MD5) Previous issue date: 1989 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:07:20Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:20-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9011014 http://hdl.handle.net/2142/23850 eng Copyright 1989 Sharifi, Fred Physics, Condensed Matter Thermal activation and macroscopic quantum phenomena in superconducting devices text Physics, Condensed Matter Physics, Condensed Matter University of Illinois at Urbana-Champaign Dissertation Ph.D.