Quantum transport, Dynamics in quantum dots, Nanofabrication of electronic devices, Mesoscopic systems, Low dimensional physics, Graphene and carbon nanotubes

Quantum nanodevices

Quantum dots are referred as an artificial atom in a sense that the electrons are confined in a small space, and they could be applied to the novel quantum devices such as single-electron devices and quantum computing devices. Although the atom-like physics is studied their interaction with light, artificial atoms can measure and control electronic properties in solid state systems. Therefore, quantum dots are expected for future electric devices that can control the single-electron charge and spin. Based on the above background, He explores novel quantum devices that have different functions with conventional transistor devices. So far, He has reported comprehensive single-electron transport results of an individual carbon nanotube quantum dots, which exhibits spin configurations in one-dimensional shell structures and demonstrates that the artificial atom can be a model for an interacting two-electron system. The present results suggest an important step for the realization of the spin-based quantum computing devices. Recently, his research has developed quantum nanodevices in graphene, consisting of an isolated single atomic layer of graphite, as unrolled carbon nanotubes. The recent discovery of novel electron-transport characteristics in graphene and few-layer graphene demonstrates that they are attractive two-dimensional conducting materials, not only as a new subject in low-dimensional physics but also as building blocks of novel quantum nanodevices. He has demonstrated a double quantum dot device in a graphene-based two-dimensional semimetal, which exhibits single-electron transport in two lateral quantum dots coupled in series. These results suggest an important step in the realization of integrated quantum devices in graphene-based nanoelect ronics.