Session B24: Focus Session: Transport in Nanostructures II: Strong Correlations

11:15 AM–2:15 PM, Monday, March 10, 2008
Morial Convention Center - 216

Sponsoring Unit: DMP
Chair: Sergio Ulloa, Ohio University

Abstract ID: BAPS.2008.MAR.B24.3

Abstract: B24.00003 : Exact-diagonalization treatment of the non-universal transport regime in few-electron quantum dots

12:03 PM–12:15 PM

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Authors:

  Leslie O. Baksmaty
  Constantine Yannouleas
  Uzi Landman
    (School of Physics, Georgia Institute of Technology)

Recently, experimental studies\footnote{M. Avinun-Kalish {\it et al.\/}, Nature {\bf 436}, 529 (2005)} have revealed a distinct second transport regime in the behavior of transmission phases obtained via Aharonov-Bohm interferometry using small quantum dots (QDs); namely, a non-universal regime for QDs with $N < 10$ electrons, in addition to the earlier known universal one for larger QDs with $N > 14$. Sophisticated (beyond-the-mean-field) many-body methods are needed for describing this non-universal regime. Here, we study the transport properties of small QDs using exact-diagonalization (EXD) calculations in conjunction with Bardeen's theory of quasiparticle mediated conductance.\footnote{For an adaptation of the formalism to QDs, see S.A. Gurvitz, arXiv:0704.1260v1} We will present EXD calculations\footnote{C. Yannouleas and U. Landman, Rep. Prog. Phys. {\bf 70}, 2067 (2007)} for anisotropic QDs, and for a wide range of anisotropies and strengths of inter-electron repulsion.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.B24.3