Abstract
We show that in-plane magnetic-field-assisted spectroscopy allows extraction of the in-plane orientation and full 3D size parameters of the quantum mechanical orbitals of a single electron GaAs lateral quantum dot with subnanometer precision. The method is based on measuring the orbital energies in a magnetic field with various strengths and orientations in the plane of the 2D electron gas. From such data, we deduce the microscopic confinement potential landscape and quantify the degree by which it differs from a harmonic oscillator potential. The spectroscopy is used to validate shape manipulation with gate voltages, agreeing with expectations from the gate layout. Our measurements demonstrate a versatile tool for quantum dots with one dominant axis of strong confinement.
- Received 31 March 2018
- Revised 5 February 2019
DOI:https://doi.org/10.1103/PhysRevLett.122.207701
© 2019 American Physical Society
Physics Subject Headings (PhySH)
Viewpoint
3D Map of a Quantum Dot’s Potential
Published 22 May 2019
A new experimental method provides a way to determine the 3D confining potential of an electron in a quantum dot, allowing improved control over the electron’s spin.
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