Tel Aviv University

Tel Aviv University
Condensed Matter Theory Seminar

Academic Year  2003 - 2004

The seminar is held in Room 204 in the Shenkar Physics Building, every Monday at 16:00


January 19, 2004

"Quantum dots with superconducting electrodes"

Prof. Yshai Avishai
Dept. of Physics and Ilse Katz Center for Nanotechnology, Ben Gurion University

   A quantum dot is a tiny region of a semiconductor material, containing a small number of strongly interacting electrons. The dot can be connected to source and drain contacts (usually electrodes composed of NORMAL metals). The physics of transport through quantum dots reveals many interesting features which are at the front of contemporary condensed matter physics. It combines fundamental concepts in quantum mechanics and many body aspects. One of them is the Kondo effect[1], which is known to occur in metals containing a small amount of magnetic atoms.

  Recently, an experiment in which a quantum dot (in fact, a carbon nano-tube) is attached to SUPERCONDUCTING leads has been reported[2]. It demonstrates an intimate relation (in fact, a competition) between the Kondo effect and the presence of the superconducting gap. We will briefly review the theoretical framework for the underlying physics[3], and discuss also the situation where the electrodes are composed of "unconventional" superconductors[4].

[1] D. Goldhaber-Gordon et. al., Nature 391, 156-159 (1998). S. M. Cronenwett et al., Science 281, 540-544 (1998).
[2] M. R. Buitelaar et al. Phys. Rev. Lett. 89, 256801 (2002).
[3] Y. Avishai, A. Golub and A. D. Zaikin, Phys. Rev. B63 13-4515 (2001).
[4] T. Aono, A. Golub and Y. Avishai, Rev. B68 045312 (2003).

Host: Dr. Ron Lifshitz, x5145
Fall 2003 Schedule Spring 2004 Schedule

For more information or for directions to 204 Shenkar please contact: Chava Balson  03-6408300

To suggest potential speakers or register feedback contact:  Ron Lifshitz  03-6405145

Sponsored by:   The Condensed Matter Physics Department, The School of Physics & Astronomy, Tel Aviv University.