Ensemble spin relaxation of shallow donor qubits in ZnO
- URL: http://arxiv.org/abs/2111.11564v3
- Date: Fri, 15 Apr 2022 19:58:15 GMT
- Title: Ensemble spin relaxation of shallow donor qubits in ZnO
- Authors: Vasileios Niaouris, Mikhail V. Durnev, Xiayu Linpeng, Maria L.K.
Viitaniemi, Christian Zimmermann, Aswin Vishnuradhan, Y. Kozuka, M. Kawasaki,
Kai-Mei C. Fu
- Abstract summary: We present an experimental and theoretical study of the longitudinal electron spin relaxation of shallow donors in the direct band-gap semiconductorO.
We derive an analytic expression for the donor spin-relaxation rate due to spin-orbit (admixture mechanism) and electron-phonon (piezoelectric) coupling for the wurtzite crystal symmetry.
- Score: 1.1467353896097323
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We present an experimental and theoretical study of the longitudinal electron
spin relaxation ($T_1$) of shallow donors in the direct band-gap semiconductor
ZnO. $T_1$ is measured via resonant excitation of the Ga donor-bound exciton.
$T_1$ exhibits an inverse-power dependence on magnetic field $T_1\propto
B^{-n}$, with $4\leq n\leq 5$, over a field range of 1.75 T to 7 T. We derive
an analytic expression for the donor spin-relaxation rate due to spin-orbit
(admixture mechanism) and electron-phonon (piezoelectric) coupling for the
wurtzite crystal symmetry. Excellent quantitative agreement is found between
experiment and theory suggesting the admixture spin-orbit mechanism is the
dominant contribution to $T_1$ in the measured magnetic field range.
Temperature and excitation-energy dependent measurements indicate a donor
density dependent interaction may contribute to small deviations between
experiment and theory. The longest $T_1$ measured is 480 ms at 1.75 T with
increasing $T_1$ at smaller fields theoretically expected. This work highlights
the extremely long longitudinal spin-relaxation time for ZnO donors due to
their small spin-orbit coupling.
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