Research

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van der Waals heterostructures for quantum optoelectronics

Our group is interested in quantum optical manipulation of spin, valley, and exciton using van der Waals (vdW) 2D materials, such as transition metal dichalcogenides (TMD), graphene, and other layered 2D materials. Fabricating heterostructure devices, we investigate ultrafast optical responses from the visible to the terahertz (THz) range.

[1] Nature Nanotechnology 13, 910-914 (2018) (pdf).
[2] Nature Communications 9, 351 (2018) (pdf).
[3] Nature Communications 7, 13569(2016) (pdf).
[4] Nature Communications 710768 (2016) (pdf).

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Topological quantum optical phenomena

We explore laser-controlled topological properties of quasiparticles using 3D and 2D topological insulators. Quantum interference of phonon-plasmon and selective spin excitation were among a few examples. Currently, we focus on the electrical and optical manipulation of such phenomena by integrating two or more dissimilar topological materials.

[1] ACS Photonics 5(8), 3347-3352 (2018) (pdf).
[2] Nano Letters 18, 734 (2018) (pdf).
[3] Nature Communications 6, 8814 (2015) (pdf).
[4] Advanced Materials 28, 1495 (2016) (pdf).

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Single photon emitters for quantum computers

Our group recently became a member of NRF Korea-funded ERC (Engineering Research Center) for developing scalable quantum computers. We will explore the optoelectronic properties of single photon emitters, such as diamond NV centers or point defects in 2D materials, and pursue developing the scalable quantum-optic interface.