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High-resolution photocurrent spectroscopy of the positive trion state in a single quantum dot

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.

For re-use rights please refer to the publisher's terms and conditions.


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-╬╝eV 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.

Publication metadata

Author(s): Mar JD, Baumberg JJ, Xu XL, Irvine AC, Stanley CR, Williams DA

Publication type: Article

Publication status: Published

Journal: Physical Review B

Year: 2013

Volume: 87

Online publication date: 30/04/2013

Date deposited: 15/06/2020

ISSN (print): 2469-9950

ISSN (electronic): 2469-9969

Publisher: American Physical Society


DOI: 10.1103/PhysRevB.87.155315


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