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Quantum Dots/Charge Qubit
We investigate single-electron transport, correlated transport, and time-dependent phenomena in quantum dots
(GaAs, Si, carbon based molecules, etc.).
We are developing quantum information technology based on electron charge and spin.
Figure: Correlated Coherent Oscillations in Coupled Semiconductor Charge Qubits
[Phys. Rev. Lett. 103, 056802 (2009)].
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Two-Dimensional System
We investigate many-body effects in two-dimensional systems, particularly in quantum Hall systems, formed in GaAs/AlGaAs or Si/SiO2 heterostructures
by transport or nuclear spin measurements. We also try to control nuclear spins in a nanoscale region.
Figure: Low-frequency electron spin dynamics in a bilayer quantum Hall system detected by resistively detected NMR [Science 313, 329 (2006)].
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Low-Temperature Nanoprobe
We study low-dimensional carrier systems through the characterization of semiconductor heterostructures and the clean surfaces
using low-temperature STM and STS.
We also carry out single-atom manipulation on semiconductor surfaces.
Figure: STM image of ''NTT'' made by In adatoms on InAs surface [Appl. Phys. Express 4, 085002 (2011)].
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