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Atomic Nuclei: Nuclear Spin State Overview

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Related Experiment Video

Updated: Jun 23, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Perfect Zeeman Anisotropy in Rotationally Symmetric Quantum Dots with Strong Spin-Orbit Interaction.

Markus Aspegren¹, Lila Chergui², Mikelis Marnauza³

¹Solid State Physics and NanoLund, Lund University, SE-221 00 Lund, Sweden.

|June 17, 2024

Summary

Researchers demonstrate tunable control over electron spin and orbital states in semiconductor quantum dots by manipulating rotational symmetry. This offers new possibilities for protecting and interacting spin-orbital states in quantum computing applications.

Keywords:

Zeeman effect quantum dot quantum ring spin−orbit interaction symmetry

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Area of Science:

Condensed Matter Physics
Quantum Information Science
Nanotechnology

Background:

Rotational symmetry in nanoscale structures, like quantum rings, influences electron orbital motion and spin-orbit interactions.
This interaction can lead to strong, anisotropic Zeeman effects, offering potential for magnetic property manipulation.
Electric fields can break symmetry, impacting magnetic properties in ring-like geometries.

Purpose of the Study:

To investigate the formation of rotationally symmetric confinement potentials in semiconductor quantum dots.
To explore the resulting electron orbitals' large orbital angular momentum and strong spin-orbit interactions.
To analyze the Zeeman effect's behavior under varying symmetry conditions and its implications for spin-qubits.

Main Methods:

Fabrication of semiconductor quantum dots with rotationally symmetric confinement potentials.
Application of magnetic fields in various orientations relative to the quantum dot plane.
Introduction of symmetry-breaking electric fields to modulate orbital interactions.

Main Results:

Complete suppression of Zeeman spin splitting was observed for magnetic fields applied in the quantum dot plane.
Spin splitting reappeared upon activation of orbital interactions via symmetry-breaking electric fields.
Demonstrated modulation of rotational symmetry to control spin-orbital interactions in a two-electron system.

Conclusions:

Semiconductor quantum dots can host electron orbitals with large angular momentum and strong spin-orbit interactions, mimicking quantum ring behavior.
Tunable suppression and reappearance of Zeeman spin splitting by controlling symmetry offer a novel approach.
Modulating rotational symmetry presents new prospects for tunable protection and interaction of spin-orbital states, relevant for spin-qubit development.