Extended spin coherence of the zinc-vacancy centers in ZnSe with fast optical access

Qubits based on crystal defect centers have been shown to exhibit long spin coherence times, up to seconds at room temperature. However, they are typically characterized by a comparatively slow initialization timescale. Here, fluorine implantation into ZnSe epilayers is used to induce defect states...

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Bibliographic Details
Published in:Communications materials 2021-09, Vol.2 (1), p.1-8, Article 91
Main Authors: Kirstein, Erik, Zhukov, Evgeny A., Smirnov, Dmitry S., Nedelea, Vitalie, Greve, Phillip, Kalitukha, Ina V., Sapega, Viktor F., Pawlis, Alexander, Yakovlev, Dmitri R., Bayer, Manfred, Greilich, Alex
Format: Article
Language:English
Subjects:
639/301/119/1001
639/766/119/997
639/766/400/1101
Chemistry and Materials Science
Crystal defects
Fluorine
Implantation
Lattice vacancies
Materials Science
Measurement methods
Nuclear spin
Polarization (spin alignment)
Qubits (quantum computing)
Room temperature
Spin dynamics
Time
Vacancies
Zinc
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Summary:Qubits based on crystal defect centers have been shown to exhibit long spin coherence times, up to seconds at room temperature. However, they are typically characterized by a comparatively slow initialization timescale. Here, fluorine implantation into ZnSe epilayers is used to induce defect states that are identified as zinc vacancies. We study the carrier spin relaxation in these samples using various pump-probe measurement methods, assessing phenomena such as resonant spin amplification, polarization recovery, and spin inertia in transverse or longitudinal magnetic field. The spin dynamics in isotopically natural ZnSe show a significant influence of the nuclear spin bath. Removing this source of relaxation by using isotopic purification, we isolate the anisotropic exchange interaction as the main spin dephasing mechanism and find spin coherence times of 100 ns at room temperature, with the possibility of fast optical access on the picosecond time scales through excitonic transitions of ZnSe. Ideal qubits should exhibit, simultaneously, long spin coherence times and fast initialization. Here, defect centers in ZnSe epilayers, introduced by ex-situ fluorine implantation, are displaying spin coherence times of 100 ns at room temperature and fast optical access on the picosecond timescale.
ISSN:2662-4443
2662-4443
DOI:10.1038/s43246-021-00198-z