Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W49: Defect Qubits IV - Rare Earth Ions for Quantum Networking
3:00 PM–5:12 PM,
Thursday, March 7, 2024
Room: 200G
Sponsoring
Unit:
DQI
Chair: Leon Zaporski
Abstract: W49.00005 : Spin-dependent optical properties of Ce-implanted MgAl2O4*
3:48 PM–4:00 PM
Presenter:
Manato Kawahara
(Research Institute of Electrical Communication, Tohoku Univ.)
Authors:
Manato Kawahara
(Research Institute of Electrical Communication, Tohoku Univ.)
Yuichiro Abe
(Tohoku Univ.)
Koki Takano
(Tohoku Univ.)
F. Joseph Heremans
(Argonne National Laboratory)
Jun Ishihara
(Tohoku Univ.)
Sean E Sullivan
(Argonne National Laboratory)
Christian W Vorwerk
(University of Chicago)
Vrindaa Somjit
(Argonne National Laboratory)
Christopher P Anderson
(The University of Chicago)
Gary Wolfowicz
(Argonne National Laboratory)
Makoto Kohda
(Tohoku Univ.)
Shunsuke Fukami
(Tohoku Univ)
Giulia Galli
(University of Chicago)
David D Awschalom
(University of Chicago)
Hideo Ohno
(Tohoku Univ)
Shun Kanai
(Tohoku University)
We implant Ce into three substrates: bare MgO substrate without cap layer (Sample A), MgO with a 10-nm-thick Al2O3 layer (Sample B), and bare MgAl2O4 substrate (Sample C). The implantation energy and the dose are 100 keV and 1.0×1014 atoms/cm2, respectively. The substrates are annealed at 1000oC in Ar atmosphere for 2 hours.
The photoluminescence (PL) spectroscopy signal is measured using a spectrometer with an excitation wavelength of 325 nm. All samples show a broad peak at around 450 nm, consistent with the 4f-5d transition of the Ce3+ center. Sample C shows 14 (8) times larger intensity than Sample A (Sample B). This increase of the PL intensity suggests an increase in the formation of the luminescent Ce3+ center [8]. Next, we investigate the polarized optical properties of Ce-implanted MgAl2O4. The degree of circular polarization (DOCP) reaches ~2% under 500 mT at 4K. This behavior suggests spin-dependent PL [9,10], which is inevitable in optical initialization and readout of the spin qubit state.
*This work has been supported in part by Shimadzu Research Foundation; Takano Research Foundation; RIEC Cooperative Research Projects; JSPS Kakenhi Nos. 19KK010, 20H02178, and 23KK0092; and JST-PRESTO No. JPMJPR21B2.
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