Metal intercalation under graphene has attracted extensive experimental and theoretical research because of its capability to manipulate the electronic structure properties graphene. However...

Graphene is a new class of two-dimensional carbon nanostructure, which holds great promise for the vast applications in many technological fields. It would be one of the prominent new materials for the next generation nano-electronic devices. In this paper the influence of various vacancy defects on the critical buckling load of a single-layered graphene nanosheet is investigated. The nanosheet...

The irradiation-induced embrittlement of the nuclear reactor pressure vessel (RPV) steels is currently a vital issue for ensuring safe operation of nuclear power plants in the world since the reactors of the first generation are going to exceed their initially designed operation lifetimes. Thus, it is of great importance to reveal the nanostructural change, attributed to the origins of the embr...

For the applications in quantum information and experiments on the foundations of quantum mechanics a robust narrow-band single photon source is desirable. We report on single photon emission from the Silicon Vacancy (SiV) centers in diamond fabricated by ion implantation. Single SiV centers are photostable and have a spectrum consisting of a sharp zero phonon line (FWHM is about 5 nm) at 738 n...

The idea of magnetic monopoles in spin ice has enjoyed much success at intermediate temperatures, but at low temperatures a description in terms of monopole dynamics alone is insufficient. Recently, numerical simulations were used to argue that magnetic impurities account for this discrepancy by introducing a magnetic equivalent of residual resistance in the system. Here we propose that oxygen ...

Sohee Park,1 Hyo-Shin Ahn,1 Choong-Ki Lee,1 Hanchul Kim,4 Hosub Jin,2 Hyo-Sug Lee,3 Sunae Seo,3 Jaejun Yu,2 and Seungwu Han1,* 1Department of Physics, Ewha Womans University, Seoul 120-750, Republic of Korea 2School of Physics and CSCMR, Seoul National University, Seoul 151-747, Korea 3Samsung Advanced Institute of Technology, Suwon 440-600, Korea 4Korea Research Institute of Standards and Scie...

Recent reports have identified bulk defects such as oxygen vacancies as key players in visible-light photoactive TiO2. This would imply greater visible light absorption rates may be possible provided effective defect engineering can be achieved. To further this we have developed methods to simulate vacancy formation in bulk TiO2 using ab initio techniques. Initial results of these methods show ...