Regensburg 1998 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 1: Ladungseffekte in Einzelelektronensystemen

TT 1.9: Vortrag

Montag, 23. März 1998, 13:00–13:15, H 19

Chaos and Interacting Electrons in Ballistic Quantum Dots — •K. Richter¹, D. Ullmo², H.U. Baranger³, F. v. Oppen⁴, and R.A Jalabert⁵ — ¹Max-Planck-Institut für Physik komplexer Systeme, Dresden — ²Division de Physique Théorique, Institut de Physique Nucléaire, 91406 Orsay Cedex, France — ³Bell Laboratories–Lucent Technologies, 700 Mountain Avenue, Murray Hill, New Jersey 07974-0636, USA — ⁴Department of Condensed Matter Physics, Weizmann Institute of Science, 76100 Rehovot, Israel — ⁵Université Louis Pasteur, IPCMS-GEMME, 23 rue du Loess, 67037 Strasbourg Cedex, France.

We show that the classical dynamics of independent particles can determine the quantum properties of interacting electrons in ballistic mesoscopic systems. This connection is established using diagrammatic perturbation theory and semiclassical finite-temperature Green functions. Specifically, the orbital magnetism is greatly enhanced over the Landau susceptibility by the combined effects of interactions and finite size. The presence of families of periodic orbits in regular systems makes their susceptibility parametrically larger than that of chaotic systems, a difference which emerges from correlation terms.