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Spectroscopy of Quantum Dot Orbitals with In-Plane Magnetic Fields

Leon C. Camenzind, Liuqi Yu, Peter Stano, Jeramy D. Zimmerman, Arthur C. Gossard, Daniel Loss, and Dominik M. Zumbühl
Phys. Rev. Lett. 122, 207701 – Published 22 May 2019
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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.

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  • 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)

Condensed Matter, Materials & Applied Physics

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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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Authors & Affiliations

Leon C. Camenzind1, Liuqi Yu1, Peter Stano2,3,4, Jeramy D. Zimmerman5,†, Arthur C. Gossard5, Daniel Loss1,2, and Dominik M. Zumbühl1,*

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
  • 2Center for Emergent Matter Science, RIKEN, Saitama 351-0198, Japan
  • 3Department of Applied Physics, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 4Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
  • 5Materials Department, University of California, Santa Barbara, California 93106, USA

  • *Corresponding author. dominik.zumbuhl@unibas.ch
  • Present address: Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA.

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Issue

Vol. 122, Iss. 20 — 24 May 2019

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