Theoretical positron lifetime values have been calculated systematically for most of the elements of the Periodic Table. Self-consistent and non-self-consistent schemes have been used for the calculation of the electronic structure in the solid, as well as different parameterizations for the positron enhancement factor and correlation energy. The results obtained have been studied and compared with experimental data, confirming the theoretical trends. As it is known, positron lifetimes in bulk show a periodic behaviour with atomic number. These calculations also confirm that monovacancy lifetimes follow the same behaviour. From this fact a strong relation between the atomic volume and the positron lifetime has been set. The effects of enhancement factors used in calculations have been commented. Finally, we have analysed the effects that f and d electrons cause in positron lifetimes.
Challenges in predicting positron annihilation lifetimes in lead halide perovskites: correlation functionals and polymorphism
Université Paris-Saclay（巴黎萨克雷大学）；CEA（法国原子能和替代能源委员会）；Service de Recherches en Corrosion et Comportement des Matériaux, SRMP（腐蚀与材料行为研究服务，SRMP）；Department of Physics, IriG, Univ. Grenoble-Alpes and CEA（格勒诺布尔阿尔卑斯大学物理系，IriG 及 CEA）；CEA/DRF/IRAMIS；University Paris-Saclay（巴黎萨克雷大学）；Department of Physics, University of Helsinki（赫尔辛基大学物理系）
Defect analysis of the $β$- to $γ$-Ga$_{2}$O$_{3}$ phase transition
Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden – Rossendorf e.V.（离子束物理与材料研究所，德累斯顿罗森多夫亥姆霍兹中心）；Institute of Radiation Physics, Helmholtz-Zentrum Dresden – Rossendorf e.V.（辐射物理研究所，德累斯顿罗森多夫亥姆霍兹中心）；Reactor Institute Delft, Delft University of Technology（代尔夫特反应堆研究所，代尔夫特理工大学）；Department of Physics, University of Helsinki（赫尔辛基大学物理系）
Role of Se vacancies on Shubnikov de Haas oscillations in Bi2Se3: a combined magneto-resistance and positron annihilation study
磁电阻测量加上正电子寿命测量，以表征空位型缺陷，已进行了拓扑绝缘体（TI）系统Bi 2 Se 3，不同的Se/Bi的比例。在4 K至10 K温度范围内，在高达15 T的磁场中进行测量时，在标称Bi2Se3.1晶体中观察到明显的Shubnikov de Haas（SdH）振荡，磁场垂直于晶体的（001）平面。量子振荡，二维电子结构的特征，被认为只有在晶体中，具有较低浓度的硒空位，从正电子湮没光谱推断。
