Session U37: Focus Session: Nanowire and Nanodot Quantum Devices
8:00 AM–11:00 AM, Thursday, March 16, 2006
Baltimore Convention Center Room: 340
Sponsoring Unit:
DMP
Chair: Alexey Bezryadin, University of Illinois, Urbana-Champaign
Abstract ID: BAPS.2006.MAR.U37.8
Abstract: U37.00008 : Kondo and Superconducting Proximity Effect in Semiconductor Nanostructures
9:48 AM–10:00 AM
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Abstract 
Authors:
Andy Vidan
Michael Stopa
Robert Westervelt
(Harvard University)
Micah Hanson
A.C. Gossard
(UC Santa Barbara)
Jie Xiang
Charles M. Lieber
(Harvard University)
We have fabricated a unique device containing three quantum dots in a GaAs/AlGaAs heterostructure containing a two-dimensional electron gas using lithographically patterned gates and an etched trench in the center of the ring. By only energizing certain gates, this device allows us to study electron transport through a single dot, a double dot, or a triple dot ring. We can determine the absolute number of electrons in a quantum dot using a nearby charge sensor and find that we are able to tune a single dot to the one and two electron regime. We find several sharp peaks in the differential conductance, occurring at both zero and finite source-drain bias, for the one and two electron quantum dot. At zero source-drain bias, the temperature and magnetic field dependence of the conductance is consistent with a standard Kondo resonance. We attribute the peaks at finite-bias to a Kondo effect through excited states of the quantum dot. We also present recent observations of supercurrents in Ge/Si 1D nanowire heterostructures.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.U37.8