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This is a Quantitative Study study.

October 18, 2025Open Access

Spin relaxation in a single-electron bilayer graphene quantum dot

LWLin WangUniversity of Konstanz GBGuido BurkardUniversity of Konstanz

Key Points

Spin relaxation in bilayer graphene is significantly affected by spin-orbit coupling and charge noise, and changes with magnetic field strength.
The study predicts that spin relaxation rates increase monotonically at high magnetic fields, highlighting the role of electron-phonon coupling mechanisms.
Results show a dip in spin relaxation rates at lower fields, due to competing interactions from bond-length change and charge noise effects.
Comparative analysis with previous experiments suggests consistent magnetic field dependence of spin relaxation, confirming theoretical predictions.

Abstract

We study the spin relaxation in a single-electron bilayer graphene quantum dot due to the spin-orbit coupling. The spin relaxation is assisted by the emission of acoustic phonons via the bond-length change and deformation potential mechanisms and 1/f charge noise. In the perpendicular magnetic-field dependence of the spin relaxation rate T1−1, we predict a monotonic increase of T1−1 at higher fields where the electron-phonon coupling via the deformation potential plays a dominant role in spin relaxation. We show a less pronounced dip in T1−1 at lower magnetic fields due to the competition between the electron-phonon coupling due to bond-length change and 1/f charge noise. Finally, detailed comparisons of the magnetic-field dependence of the spin relaxation with the existing experiments by Banszerus and Gächter are reported.

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