We show that in-plane-magnetic-field assisted spectroscopy allows extraction of the in-plane orientation and full 3D shape of the quantum mechanical orbitals of a single electron GaAs lateral quantum dot with sub-nm precision. The method is based on measuring orbital energies in a magnetic field with various strengths and orientations in the plane of the 2D electron gas. As a result, we deduce the microscopic quantum dot 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.
@article{arxiv.1804.00162,
title = {Spectroscopy of Quantum-Dot Orbitals with In-Plane Magnetic Fields},
author = {Leon C. Camenzind and Liuqi Yu and Peter Stano and Jeramy Zimmerman and Arthur C. Gossard and Daniel Loss and Dominik M. Zumbühl},
journal= {arXiv preprint arXiv:1804.00162},
year = {2019}
}
Comments
4 pages, 3 color figures, including supplementary on arXiv