- 著者
- Yamashita K. Ougolkov A.V. Nakazato H. Ito K. Ohashi Y. Kitakata H. Yasumoto K. Omote K. Mai Wei Takahashi Y. Minamoto Toshinari
- 出版者
- 金沢大学がん研究所 = Kanazawa University Cancer Research Institute
- 雑誌
- Cancer Research Institution Report = がん研究所年報 (ISSN:03880192)
- 巻号頁・発行日
- vol.2006-2008, pp.71, 2009-03-01
Division of Translational and Clinical Oncology
- 著者
- Ito K. Skibsted E.
- 出版者
- Elsevier Inc.
- 雑誌
- Advances in mathematics (ISSN:00018708)
- 巻号頁・発行日
- vol.248, pp.945-962, 2013-11
- 被引用文献数
- 8 10
In this paper we study absence of embedded eigenvalues for Schrödinger operators on non-compact connected Riemannian manifolds. A principal example is given by a manifold with an end (possibly more than one) in which geodesic coordinates are naturally defined. In this case one of our geometric conditions is a positive lower bound of the second fundamental form of angular submanifolds at infinity inside the end. Another condition is an upper bound of the trace of this quantity, while a third one is a bound of the derivatives of part of the trace (some oscillatory behaviour of the trace is allowed). In addition to geometric bounds we need conditions on the potential, a regularity property of the domain of the Schrödinger operator and the unique continuation property. Examples include ends endowed with asymptotic Euclidean or hyperbolic metrics.
- 著者
- Uedono A. Shaoqiang C. Jongwon S. Ito K. Nakamori H. Honda N. Tomita S. Akimoto K. Kudo H. Ishibashi S.
- 出版者
- American Institute of Physics
- 雑誌
- Journal of applied physics (ISSN:00218979)
- 巻号頁・発行日
- vol.103, no.10, pp.104505, 2008-08
- 被引用文献数
- 22 27
A relationship between intra-4f transitions of Er and vacancy-type defects in Er-doped GaN was studied by using a monoenergetic positron beam. Doppler broadening spectra of the annihilation radiation were measured for Er-doped GaN grown by molecular beam epitaxy. A clear correlation between the defect concentration and the photoluminescence (PL) intensity was observed. The major defect species detected by positrons was identified as a Ga vacancy VGa, and its concentration increased with increasing Er concentration [Er]. For the sample with [Er]=3.3 at. %, the maximum integrated intensity of PL was observed. The VGa concentration was above 1018 cm−3 and additional vacancies such as divacancies started to be introduced at this Er concentration. For the sample with higher [Er], the PL intensity decreased, and the mean size of vacancies decreased due to an introduction of precipitates and/or metastable phases.
- 著者
- Narahara A. Ito K. Suemasu T. Takahashi Y. K. Ranajikanth A. Hono K.
- 出版者
- American Institute of Physics
- 雑誌
- Applied physics letters (ISSN:00036951)
- 巻号頁・発行日
- vol.94, no.20, pp.202502, 2009-05
- 被引用文献数
- 62 29
The spin polarization of (100)-oriented gamma[prime]-Fe4N layers grown on MgO(001) substrates by molecular beam epitaxy was deduced from point contact Andreev reflection measurements, and the value was compared with that of alpha-Fe. The spin polarization (P) for gamma[prime]-Fe4N is approximately 0.59 at 7.8 K. This value is distinctly larger than that for alpha-Fe (P=0.49 at 7.8 K) measured with an identical setting. The mechanism of enhanced spin polarization in gamma[prime]-Fe4N is discussed.