The Norman Hascoe Distinguished Lecture Series

Atomic and Molecular Scale Electronic Transport

Mark A. Reed
Departments of Electrical Engineering and Applied Physics
Yale University

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, spanning semiconductor, metallic, and organic embodiments.

In metallic systems, the resultant transport is conductance quantization at room temperature. A novel inherently stable microfabricated atomic junction, with a mechanical stability of approximately 3picometers, will be discussed. [1,2]

In semiconductor systems, an ultimate quantum dot [3] is created by a single impurity in a heterostructure quantum well. Zeeman splitting of a single atom is demonstrated [4]. The magnitude of the effective magnetic spin splitting factor g* and electron tunneling rates through potential barriers are measured.

In organic systems, electronic transport in a variety of stable self-assembled conjugated oligomers is demonstrated. The electronic properties of single and/or few molecule systems will be discussed, 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.  C.J.Muller et al, Phys. Rev. B53, 1022 (1996).
2.  C.Zhou et al, Appl. Phys. Lett. 67, 1160 (1995).
3.  M.A.Reed et al, Phys. Rev. Lett. 60, 535 (1988).
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)
9.  M.A.Reed, Appl. Phys. Lett. 78, 3735 (2001).

There will be an informal discussion with students in Room P121 from 3:00-3:45 PM

Monday, February 24, 2003
4:00 PM
Gant Science Complex
Physics Department
Room P38

(Refreshments will be served beginning at 5:00 PM, with a panel discussion from 5:20 PM.)


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