Our group seeks to elucidate the behavior of quantum low-dimensional materials with a strong emphasis on atomic scale engineering capability. This research entails building a novel platform where we combine the state-of-the-art atomic resolution transmission electron microscopy (TEM) and modern semiconductor nanodevice fabrication techniques.
We engineer novel designer interface by assembling various 2-D van der Waals building block crystals. By creating moiré superlattice and engineering the atomic scale reconstruction, we seek to investigate the emergent phenomena that exhibit quantum electronic and topological flavor.
#van der Waals (vdW) materials #atomic scale engineering #moiré superlattice
K. Ko et al. Nat. Mater. 22, 992 (2023); *J. Kim et al. Nat. Mater. 21, 890 (2022);* *S. Sung et al. Nat. Commun. 13, 7826 (2022);* *X. Liu et al. Nature 583, 221 (2020); J. Sung et al. Nat. Nanotechnol. 15, 750 (2020); H. Yoo et al. Nat. Mater. 12, 448 (2019); S.S. Sunku et al. Science 362, 1153 (2018);*
Our group use transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) to study the structures of materials from microscale down to the very atomic scale. Understanding the electron optics inside the microscopy and electron diffraction in crystals is key to investigate the structures of condensed matter. We study the atomic structure to understand the underlying materials physics.
#transmission electron microscopy (TEM) #scanning transmission electron microscopy (STEM) #electron diffraction #image reconstruction #materials physics #correlation
K. Ko et al. Nat. Mater. 22, 992 (2023); H. Yoo et al. Nat. Mater. 12, 448 (2019); H. Yoo et al. Appl. Phys. Lett. 112, 131901 (2018); H. Yoo et al. Appl. Phys. Lett. 102, 051908 (2013); H. Yoo et al. Adv. Mater. 24, 515 (2012)
We explore electrical transport behavior of atomically engineered material system. We fabricate various types of electrical devices in mesoscopic scale to measure the low-energy electrical transport behavior. This allows us to investigate the electronic band structures as well as quantum electronic charge transport behavior.