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Browsing by Author "Ahokas J."

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Bose-einstein condensation of magnons in atomic hydrogen gas

Vainio O.; Ahokas J.; Järvinen J.; Lehtonen L.; Novotny S.; Sheludiakov S.; Suominen K.; Vasiliev S.; Zvezdov D.; Khmelenko V.; Lee D. (2015)

© 2015 American Physical Society. We report on experimental observation of Bose-Einstein condensation (BEC)-like behavior of quantized electron spin waves (magnons) in a dense gas of spin-polarized atomic hydrogen. The ...
Dynamic nuclear polarization and ESR hole burning in As doped silicon

Järvinen J.; Zvezdov D.; Ahokas J.; Sheludiakov S.; Lehtonen L.; Vasiliev S.; Vlasenko L.; Ishikawa Y.; Fujii Y. (2020)

© the Owner Societies 2020. We present an experimental study of the Dynamic Nuclear Polarization (DNP) of29Si nuclei in silicon crystals of natural abundance doped with As in the temperature range 0.1-1 K and in a strong ...
Dynamic nuclear polarization of high-density atomic hydrogen in solid mixtures of molecular hydrogen isotopes

Sheludiakov S.; Ahokas J.; Järvinen J.; Zvezdov D.; Vainio O.; Lehtonen L.; Vasiliev S.; Mao S.; Khmelenko V.; Lee D. (2014)

© 2014 American Physical Society. We report on magnetic resonance studies of high-density atomic hydrogen and deuterium in solid hydrogen matrices at temperatures below 1 K. Average concentrations of H atoms ≈3×1019 cm-3 ...
Dynamic Polarization and Relaxation of <sup>75</sup>As Nuclei in Silicon at High Magnetic Field and Low Temperature

Järvinen J.; Ahokas J.; Sheludiakov S.; Vainio O.; Zvezdov D.; Lehtonen L.; Vlasenko L.; Vasiliev S. (2017)

© 2017, Springer-Verlag Wien.We present the results of experiments on dynamic nuclear polarization and relaxation of 75As in silicon crystals. Experiments are performed in strong magnetic fields of 4.6 T and temperatures ...
Efficient dynamic nuclear polarization of phosphorus in silicon in strong magnetic fields and at low temperatures

Järvinen J.; Ahokas J.; Sheludyakov S.; Vainio O.; Lehtonen L.; Vasiliev S.; Zvezdov D.; Fujii Y.; Mitsudo S.; Mizusaki T.; Gwak M.; Lee S.; Vlasenko L. (2014)

© 2014 American Physical Society. Efficient manipulation of nuclear spins is important for utilizing them as qubits for quantum computing. In this work we report record high polarizations of 31P and Si29 nuclear spins in ...
Electron Spin Resonance Study of Electrons Trapped in Solid Molecular Hydrogen Films

Sheludiakov S.; Ahokas J.; Järvinen J.; Vainio O.; Lehtonen L.; Zvezdov D.; Khmelenko V.; Lee D.; Vasiliev S. (2015)

© 2015 Springer Science+Business Media New York We report on the measurements of electrons trapped in solid molecular films of H(Formula presented.), HD, and D(Formula presented.). A narrow ESR line associated with the ...
Electron Spin Resonance Study of Electrons Trapped in Solid Molecular Hydrogen Films

Sheludiakov S.; Ahokas J.; Järvinen J.; Vainio O.; Lehtonen L.; Zvezdov D.; Khmelenko V.; Lee D.; Vasiliev S. (2016)

© 2015, Springer Science+Business Media New York.We report on the measurements of electrons trapped in solid molecular films of H (Formula presented.) , HD, and D (Formula presented.). A narrow ESR line associated with the ...
Experimental cell for molecular beam deposition and magnetic resonance studies of matrix isolated radicals at temperatures below 1 K

Sheludiakov S.; Ahokas J.; Vainio O.; Zvezdov D.; Vasiliev S.; Khmelenko V.; Mao S.; Lee D. (2014)

We present the design and performance of an experimental cell constructed for matrix isolation studies of H and D atoms in solid H2/D 2 films, which are created by molecular beam deposition at temperatures below 1 K. The ...
Guiding and trapping of electron spin waves in atomic hydrogen gas

Vainio O.; Ahokas J.; Novotny S.; Sheludyakov S.; Zvezdov D.; Suominen K.; Vasiliev S. (2012)

We present a high magnetic field study of electron spin waves in atomic hydrogen gas compressed to high densities of ∼1018cm -3 at temperatures ranging from 0.26 to 0.6 K. We observed a variety of spin wave modes caused ...
Microscopic control of Si 29 nuclear spins near phosphorus donors in silicon

Järvinen J.; Zvezdov D.; Ahokas J.; Sheludyakov S.; Vainio O.; Lehtonen L.; Vasiliev S.; Fujii Y.; Mitsudo S.; Mizusaki T.; Gwak M.; Lee S.; Vlasenko L. (2015)

© 2015 American Physical Society. We demonstrate an efficient control of Si29 nuclear spins for specific lattice sites near P31 donors in silicon at temperatures below 1 K and in a high magnetic field of 4.6 T. Excitation ...
Tunneling chemical exchange reaction D + HD → D<inf>2</inf> + H in solid HD and D<inf>2</inf> at temperatures below 1 K

Sheludiakov S.; Ahokas J.; Järvinen J.; Zvezdov D.; Lehtonen L.; Vainio O.; Vasiliev S.; Lee D.; Khmelenko V. (2016)

© 2016 the Owner Societies.We report on a study of the exchange tunneling reaction D + HD → D2 + H in a pure solid HD matrix and in a D2 matrix with a 0.23% HD admixture at temperatures between 130 mK and 1.5 K. We found ...

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Browsing by Author "Ahokas J."

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