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Lookup NU author(s): Dr Jonathan Mar
This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2013.
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We demonstrate high-resolution photocurrent spectroscopy of the positive trion state (X+) in a single InAs/GaAs self-assembled quantum dot (QD). Exploiting a Coulomb-mediated renormalization of the X+ transition energy, our approach allows for a sub-μeV resolution, which is more than four orders of magnitude higher than that in previous approaches. Furthermore, such high-resolution spectroscopy of X+ permits us to obtain precise values for the X+ permanent dipole moment and polarizability, by fitting a theoretical model to the measured transition energy as a function of electric field. Since optical initialization, manipulation, and readout of a QD spin rely on the trion state as an intermediary state, such high-resolution measurements of the X+ spectrum and its dipole moment are essential for performing high-fidelity quantum computing operations on QD spin qubits.
Author(s): Mar JD, Baumberg JJ, Xu XL, Irvine AC, Stanley CR, Williams DA
Publication type: Article
Publication status: Published
Journal: Physical Review B
Online publication date: 30/04/2013
Date deposited: 15/06/2020
ISSN (print): 2469-9950
ISSN (electronic): 2469-9969
Publisher: American Physical Society
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