open access

https://hdl.handle.net/2115/97375

Effect of Oblique Magnetic Field on Dynamic Nuclear Polarization in Single Self-Assembled Quantum Dots Governed by Nuclear Quadrupole Interaction

英語

quantum dots

2025-07

Wiley-Blackwell

Physica status solidi B-basic solid state physics

262(7)

2400535

The dynamic nuclear spin polarization dominated by the nuclear quadrupole interaction has been studied in a single self-assembled quantum dot. Spin transfer from an optically injected spin-polarized electron to the lattice nuclear spin ensemble results in the nuclear spin polarization, which is probed by standard magnetophotoluminescence measurements under off-resonant excitation. In an oblique magnetic field configuration, the observed electron spin depolarization curve, the Hanle curve, has a significantly different behavior compared to the previously reported anomalous Hanle curves obtained in a transverse magnetic field. In particular, an asymmetry in the Hanle curve depending on the sign of the external magnetic field indicates that the inclination of the magnetic field largely modifies the spin configurations during the dynamic nuclear spin polarization process. Numerical simulations based on a model in which the electron and nuclear spin states are described by the Bloch equation and the rate equation for the occupancy of nuclear spin eigenstates, respectively, reproduce the observations. This comparison supports the importance of the in-plane component of the principal axis of the nuclear quadrupole interaction in generating the large in-plane nuclear field, known as the anomalous Hanle effect.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: Yamamoto, S., Kaji, R., Sasakura, H. and Adachi, S. (2025), Effect of Oblique Magnetic Field on Dynamic Nuclear Polarization in Single Self-Assembled Quantum Dots Governed by Nuclear Quadrupole Interaction. Phys. Status Solidi B, 262: 2400535, which has been published in final form at https://doi.org/10.1002/pssb.202400535. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

0370-1972