Engineering Exchange Interaction in Coupled Spin-Qubit Quantum Dots
Zhang, Lingxiao
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https://hdl.handle.net/2142/81107
Description
Title
Engineering Exchange Interaction in Coupled Spin-Qubit Quantum Dots
Author(s)
Zhang, Lingxiao
Issue Date
2008
Doctoral Committee Chair(s)
Leburton, Jean-Pierre
Department of Study
Electrical and Computer Engineering
Discipline
Electrical and Computer Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
For coupled quantum dots formed in a single InAs quantum wire, we use the variational Heitler-London method to obtain the single- and two-particle ground state energies. We show the variational Heitler-London methods yield lower ground state energies than the conventional approach. We find that the exchange energy decreases as the wire diameter becomes smaller due to enhanced coulomb interaction in a quasi-one-dimensional system.
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