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The Ubiquitous SQUID: Then and Now (Prof. John Clarke, 88)
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Special Condensed Matter Seminar

 

Speaker: Prof. John Clarke

             Department of Physics, University of California, Berkeley

 

Title: The Ubiquitous SQUID: Then and Now

 

Date: 11:00 am, October 25 (Friday), 2013

 

Place: Rm. 620, Physics Building

 

Abstract:

Following Brian Josephson’s prediction in 1962, Josephson tunneling through an oxide barrier separating two superconducting films was first observed in 1963, one-half century ago. The following year saw the demonstration of quantum interference in a superconducting ring containing two Josephson junctions—the birth of the SQUID(Superconducting QUantum Interference Device). I describe an early practical device, known as the SLUG, which consisted ofa blob of solder frozen around a length of niobium wireto form an exquisitely sensitive voltmeter. Today’s SQUIDs, fabricated from patterned, multilayer thin films on silicon wafers, offer extraordinary sensitivity to magnetic flux. These SQUIDs can be configured for a wide range of applications, including magnetometers and quantum-limited amplifiers. I describe experiments to search for the axion—a candidate particle for cold dark matter—and to perform magnetic resonance imaging (MRI) in microtesla magnetic fields, four orders of magnitude lower than in clinical MRI systems.

 

 

About  the speaker:

 

John Clarke received his B.A. (1964), Ph.D. (1968), and Sc.D. (2005) from Cambridge University.  After a postdoctoral fellowship at UC Berkeley, he joined the Physics faculty in 1969.  He received the Distinguished Teaching Award in 1983.  He is a fellow of the Royal Society of London, the American Physical Society, the American Association for the Advancement of Science, and the Institute of Physics (UK).  He has been a Sloan Foundation Fellow, a Guggenheim Fellow and a Miller Professor.  In 1987, he was named California Scientist of the Year and was awarded the Fritz London Prize for research in low-temperature physics.  In 1998, he received the American Physical Society’s Joseph F. Keithley Award for Advances in Measurement Science and, in 1999, the National Academy of Sciences’ Comstock Prize for Physics.  He was awarded the Hughes Medal of the Royal Society in 2004, and was the UC Berkeley Faculty Research Lecturer in 2005.

 

 

Host: Cheng-Chung Chi (齊正中), cchi@phys.nthu.edu.tw, 42542 or 0920-786007.

Please send me an email if you are interested in having lunch with Prof. Clarke after his talk, and/or having a discussion session with him in the afternoon. 

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作者: Prof. John Clarke
日期: 2013-10-25
上架時間: 2013-10-25 15:06:12
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