Angle-resolved photoelectron spectroscopy is a powerful technique that measures the electronic structure of low D atomic crystals. We are constructing a spin and angle resolved photoemission beamline in collaboration with Pohang Light Source, which is based on new type of spin detector to achieve world top level performance in mapping out spin resolved band structures.
AFM with tuning fork sensor facilitates atomic level investigation of insulators, where STM cannot work. The combination of STM and AFM study provides decoupling of electronic contribution in STM topography, which is essential to exploit localized electronic states. The AFM will explore structural, electrical, mechanical properties of new 1D/2D materials and their heterostructure regardless of local conductivity.
This equipment has a unique feature of analyzing photon intensity and spectrum coming from STM junctions. Recently we have installed components for tip-enhanced Raman spectroscopy. We are studying optical properties of single nanometer-sized light sources, mainly, single planar inorganic molecules on decoupling layers.
This equipment can be said to be a sub-system of sub-Kelvin high magnetic field photon STM, which is under construction. 9 in-situ ports aiming the STM junction facilitates pre-study of single spin centers of single atoms and molecules.
A homemade sub-Kelvin cryostat is being constructed. We use image guides, which is originally for endoscopes, to collect photons in the center of our superconducting magnet center. In this sense this system will be very unique in the world, and will give a strong impact on STM instrumentation.
This equipment is designed for single spin STM experiments. So, both ordinary 10 K STM routines with in-situ dosing and milli-Kelvin high magnetic field STM measurements are possible. Many unique features have been implemented to reach lowest electron temperature at sample surfaces.
This equipment is designed for simultaneous STM and transport measurements at various temperatures from 10 K to 300 K. The STM is used to explore thin 2D materials as well as their heterostructures. To get contamination-free surfaces, it is carefully designed to be connected to the ultra-high vacuum suitcase, which contains well-prepared 2D materials without exposure to air.
Raman scattering is widely used to study lattice, magnetic and electronic excitations in solids. Our system is capable of measuring small-energy excitations down to ~10 cm-1 with the selection of incoming and outgoing polarizations of the light that allows to disentangle contributions from different irreducible representations of the space group of the system.
RIXS is a momentum-and energy-resolved technique that has access to charge, orbital, and spin dynamics over the full Brillouin zone and a very wide energy range. We are constructing a high-resolution hard x-ray RIXS beamline targeted for 5d transition-metal compounds in collaboration with Pohang Light Source.
The dilution refrigerator combined with high field magnet provides extremely low temperature (~10mK) and high magnetic field (~20T) conditions for investigating various interesting quantum phenomena in low dimensional materials
The electron-ion dual beam lithography system and clean room facility enable fabrication of various quantum materials. Precise control of electronic conduction is critical to observe new physical phenomena. We can tailor a small single crystal in a specific shape for a designed experiment in sub-μm scale by using focused ion beam (FIB) milling process. Furthermore, we can fabricate electron-beam resist-free device patterns with this lithography facility by combining the gas injection system (GIS).