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Atomic and Molecular Scale Electronic Transport

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Abstract:
The charge transport and conductance measurement of a single atom or moiety is an intriguing, experimentally challenging, and long sought goal. This talk presents these measurements in a variety of systems, starting from the first measurements on quantum dots [1] and over a decade evolving into other semiconductor, metallic, and organic systems. In metallic systems, one observes conductance quantization effects at room temperature. We report on a novel inherently stable microfabricated atomic junction, which has a mechanical stability of approximately 3pm, designed to observe these effects. [2,3] In semiconductor systems, we are able to isolate and measure a single impurity in a heterostructure quantum well. We observe Zeeman splitting of a single impurity [4], determine the magnitude of the effective magnetic spin splitting factor g*, and perform an independent measurement of the electron tunneling rates through potential barriers. In organic systems, we have measured the electronic transport of a variety of stable self-assembled conjugated oligomers. We present the electronic properties of single and/or few molecule systems including the electrical transport properties of a single molecule [5], systematic measurements of the barriers and transport mechanisms of these molecules [6,7], and potential device applications (the molecular equivalent of a resonant tunneling device [8] and a molecular dynamic random access memory [9]). 1. M. A. Reed et al, Phys. Rev. Lett. 60, 535 (1988). 2. C. J. Muller et al, Phys. Rev. B53, 1022 (1996). 3. C. Zhou et al, Appl. Phys. Lett. 67, 1160 (1995). 4. M.R. Deshpande et al, Phys. Rev. Lett. 76, 1328 (1996). 5. M. A. Reed et al., Science 278, 252 (1997). 6. C. Zhou et al., Appl. Phys. Lett. 71, 611 (1997). 7. J. Chen et al., Chem Phys Lett 313, 741 (1999). 8. J. Chen et al., Science 286, 1550 (1999); Appl. Phys. Lett., 77, 1224 (2000) M. A. Reed, Appl. Phys. Lett. 78, 3735 (2001).

http://www.eng.yale.edu/reedlab/
Type of Seminar:
New Vistas
Speaker:
Prof. Mark REED
Harold Hodgkinson Professor of Engineering and Applied Science Departments of Electrical Engineering and Applied Physics, Yale University 15 Prospect Street PO Box 208284, New Haven CT 06520-8284
Date/Time:
May 13, 2002   17:15
Location:

ETF E1
Contact Person:

Prof. M. Morari
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Biographical Sketch:
Mark Reed received his B.S. with Honors in Physics from Syracuse University in 1977, and continued there where he received his M.S. in Physics in 1979 and his Ph. D. degree in Solid State Physics in 1983. He then joined Texas Instruments as a Member of the Technical Staff in the Ultrasmall Electronics Branch, where he co-founded the Nanoelectronics research program. In 1988 he was elected to Senior Member of the Technical Staff. In 1990 Mark left TI to join the faculty at Yale University where he presently holds a joint appointment as Professor in the Electrical Engineering and Applied Physics departments. From 1995 to 2001, he served as the Chairman of Electrical Engineering, where his teaching interests include outreach of technology to non-science students and mentoring promising young talent including the national winners of the Intel, Westinghouse, and STS science competitions. In 1999, he co-founded the Molecular Electronics Corp. His research activities have included the investigation of nanoscale and mesoscopic systems, electronic transport in heterojunction systems, artificially structured materials and devices, MEMS and bioMEMS, nanotechnology, and molecular electronics. Mark is the author of more than 110 professional publications, has given six plenary and over 150 invited talks, and holds 17 U.S. and foreign patents on quantum effect, heterojunction, and molecular devices. His books credits include Nanostructure Physics and Fabrication (1989), Nanostructures and Mesoscopic Systems (1992), Nanostructured Systems (in the series Semiconductors and Semimetals), and Molecular Electronics (2001). He has chaired numerous international conferences and program committees, and has served as an associate editor for a number of technical journals (such as Physical Review Letters and Physica E). He has been elected to the Connecticut Academy of Science and Engineering and Who's Who in the World. His awards include; Fortune Magazine “Most Promising Young Scientist” (1990), the Kilby Young Innovator Award (1994), the DARPA ULTRA Most Significant Acheivement Award (1997), the Harold Hogkinson Chair of Engineering and Applied Science at Yale University (1999), the Syracuse University Distinguished Alumni award (2000), the Forbes magazine “E-Gang” (2001), and the Fujitsu ISCS Quantum Device Award (2001). Relevant articles for the non-expert by the speaker / about the speakers work