| Title: |
Nuclear quadrupole interaction and zero first-order Zeeman transitions of 167Er3+ in CaWO4 |
| Authors: |
Marsh, L; Yikai, Y; Mattiroli, C; Sayat, MT; Trí, ĐM; Rønnow, HM; Longdell, JJ; Soh, J-R |
| Publisher Information: |
American Physical Society |
| Publication Year: |
2026 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
We report microwave spectroscopy of 167Er3+ doped in CaWO4 which reveals the hyperfine splitting of the erbium electronic ground state (Z1, Jeff=15/2) induced by the I=7/2 nuclear spin. From spectra measured below~50 mK in magnetic fields up to 200 mT, we extract spin Hamiltonian parameters including the electron g, hyperfine A, and nuclear electric quadrupolar Q tensors. Crucially, our analysis demonstrate unambiguously, that the previously unobserved nuclear electric quadrupolar moment is essential to reproduce the experimental data. With these refined parameters, we identify zero first-order Zeeman (ZEFOZ) transitions at zero magnetic field. Extending the analysis to finite fields, we uncover that ZEFOZ points lie either along the c axis or within the a-b plane. These results establish CaWO4 as a promising host for long lifetime quantum memories. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1103/pg5m-hk2n |
| Availability: |
https://doi.org/10.1103/pg5m-hk2n; https://ora.ox.ac.uk/objects/uuid:de06532c-bf44-4f86-b685-8b26237da250 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.807B03BC |
| Database: |
BASE |