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Friday, Sept. 23, 2011
10:45 a.m., NSERL 3.204

 

 

 

 

 

 

 

"Open Quantum Dots: Quantum-Classical Connection"
David K. Ferry,
School of Electrical, Computer & Energy Engineering; The Department of Physics,
Arizona State University, Tempe, AZ

Abstract
Quantum dots provide a natural system in which to study both classical and quantum features of transport.  They provide a prototype system with a very rich set of eigenstates and when coupled to the environment through a pair of quantum point contacts, provide a rich set of experimental observations.  In the classical sense, these dots possess a mixed phase space which yields families of closed, regular orbits as well as an expansive sea of chaos.  The question which one would like to address is the manner in which these classical states evolve into the set of quantum states that populate the dot in the quantum limit.  In the reverse direction, the manner in which the quantum states evolve to the classical world is governed strongly by Zurek’s decoherence theory. Here, we discuss the nature of the various classical states, how they are formed, how they progress to the quantum world, and the signatures that they create in magnetotransport and general conductance studies of these dots.  In addition, we discuss the experimental observations which support the theory, and discuss the use of scanning gate microscopy to image the various quantum states.

FerryBio
Prof. Ferry received the B.S.E.E. and M.S.E.E. degrees from Texas Tech University, Lubbock, in 1962 and 1963, respectively, and the Ph.D. degree from the University of Texas (UT), Austin, in 1966.  Following this, he had an National Science Founda­tion Postdoctoral Fellowship in Vienna, Austria. From 1967 to 1973, he was a Faculty Member with Texas Tech University, and then joined the Office of Naval Research, Washington, DC. From 1977 to 1983, he was with the Col­orado State University at Fort Collins, where he served as Professor and Chair of the Department.  He then joined Arizona State University (ASU), Tempe, where he has served as Director of the Center for Solid State Electronics Research from 1983 to 1989, as Chair of Electrical Engineering from 1989 to 1992, and as Associate Dean for Research from 1993 to 1995. His research interests include transport physics and modeling of quantum effects in ultrasmall semiconductor devices and electron beam lithography for ultrasub­micron quantum functional devices. He has published more than 800 articles, books, book chapters, and conference publications.  Dr. Ferry was selected as one of the first Regents’ Professors at ASU in 1988, and received the IEEE Cledo Brunetti Award for advances in nanoelectronics in 1999. He is a Fellow of the American Physical Society, the Institute of Electrical and Electronics Engineers, and the Institute of Physics (UK).   He also serves as Editor of the Journal of Computational Electronics and Editor-in-Chief of the Journal of Physics: Condensed Matter.