Scientists from South Korea, Japan and Britain have used the so-called quantum effect to successfully create the world\'s smallest transistor that could be used to enhance the capabilities of mobile electronic devices, a local researcher said Tuesday. Chungbuk National University professor Choi Jung-bum, who led the joint research, said the quantum effect transistor, which is just 2 nanometers in size, can operate in regular room temperature and effectively changes the entire paradigm of such devices.