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The Effects of Selective Doping on Electron Transport in Two-Dimensional Electron Gases


Olsen, Ben Andrew (2006) The Effects of Selective Doping on Electron Transport in Two-Dimensional Electron Gases. Senior thesis (Major), California Institute of Technology. doi:10.7907/2k1t-3g27.


Recent research on bilayer two-dimensional electron gasses (2DEG) indicates the possibility of excitonic superfluidity, though experiments have measured small dissipation due to motion of unpaired vortices. In regular superconductors, carriers flow without dissipation beacuse vortices are "pinned" by impurities. This research investigates the effects of C and Si dopants within the quantum well of a single quantum well 2DEG. These dopants are candidates for improving vortex pinning in bilayer 2DEG systems. Four C-doped samples, with dopant density ranging from 3.5 x 1014cm-3 to 2.5 x 1016 cm-3 , and one Si-doped sample, with 2.3 x 1015m-3 Si ions are studied by electron transport measurements as functions of magnetic field strength. We find that minima in longitudinal resistance as a function of filling factor 11 are wider and offset toward'S lower v in samples with higher doping. This widening and shift is shown by mimina up to a v that decreases with increasing C dopant density, but is not observed at all for minima in the Si-doped sample.

Item Type:Thesis (Senior thesis (Major))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Withheld
Research Advisor(s):
  • Eisenstein, James P.
Thesis Committee:
  • None, None
Defense Date:1 May 2006
Record Number:CaltechTHESIS:02132018-144035454
Persistent URL:
Olsen, Ben Andrew0000-0002-6551-6812
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10720
Deposited By: Joy Painter
Deposited On:13 Feb 2018 23:51
Last Modified:20 May 2020 19:22

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