Current Research Projects
Exciton-polaritons are quantum Bosonic partibles, arising from a strong light-matter coupling in microcavity structures. They exhibit Bose-Einstein condensation in the dilute density limit and at elevated temperatures near 4 K for GaAs semiconductors. Using various optical characterization techniques, we have investigated quantum phase order arising from exciton-polariton condensates in various two-dimensional lattice geometries.
We propose a novel hybrid scheme to address single nuclear spin of dopants in Si. Optically, the nuclear spin and unpaired electron spin states of a donor are transferred to donor bound exciton states, and electrically the nuclear spin state is detected by a quantum Hall edge channel near a quantum point contact. We benefit from the highly sensitive optical transition and the robust quantum Hall conductance plateaus against spurious noise effects. This hybrid electrical and optical scheme would be a new approach to develop silicon based quantum qubit systems.
Previous Research Projects
We propose a solid-state Fermi-Hubbard quantum emulator. As one possible implementation scheme, we consider electrons trapped by dynamical lattices fromed by surface acoustic waves or statice lattices by electric field in a two-dimensional electron gas systems. A metal-insulator quantum phase transition described by one- and two-band Hubbard model can be observable via a large quantum-dot array within currently available technologies.
We have examined strongly correlated electron transport properties in one-dimensional conductors with single-walled carbon nanotubes an ideal model system. In low-dimensional conductors, particle interactions cannot be negligible due to the insufficient charge screening. Indeed, there exists inherent Coulomb correlation features among electrons in ballistic one-dimensonal conductors, which are revealed in the low-frequency shot noise properties and explained in the Tomonaga-Luttinger liquid framework.