Illuminate Physics behind Quantum Materials
Noguchi Research Group at NTU-CCMS since April 2025
Welcome to the SpecTopo Lab (Spectroscopy of Topological quantum materials Lab) at the Center for Condensed Matter Sciences, National Taiwan University (NTU-CCMS) led by Dr. Ryo Noguchi. What if we could see — and even control — the hidden quantum world inside exotic materials? At SpecTopo Lab, our curiosity drives us to explore the electronic structures behind fascinating quantum phenomena and learn how to manipulate them on demand. To tackle these big questions, we’re building cutting-edge tools like laser-based ARPES and optical spectroscopy for both equilibrium and non-equilibrium studies. We’re also going to powerful synchrotron facilities to dive even deeper into the mysteries of quantum materials.
Quasi-1D WTI Bi4I4
News
New group members (2025)
Welcome our new members: Xuan Feng, Ching-Chin Tsai, and Tuan-Lin Chang!
The 2030 Cross-Generation Young Scholars Program – International Outstanding Young Scholars (August 2025)
The National Science and Technology Council (NSTC) has selected our group for the 2030 Cross-Generation Young Scholars Program – International Outstanding Young Scholars. We are currently establishing our laboratory at the Center for Condensed Matter Sciences, National Taiwan University, to develop cutting-edge spectroscopy techniques and advance the study of topological quantum materials.
We welcome motivated graduate and undergraduate students to join us in exploring the fascinating physics of quantum materials. If you are interested, please reach out to Dr. Ryo Noguchi.
Yushan Young Fellow (August 2025)
Dr. Ryo Noguchi has been elected as Yushan Young Fellow by the Ministry of Education of Taiwan.
Openings: Research Assistants (April 2025)
We welcome enthusiastic undergraduate or graduate students who wish to join the group. If interested in joining, please contact us for possible activities. The details of the job announcement can be found here.
Our group started (April 2025)
Dr. Ryo Noguchi joined NTU-CCMS on 1/4/2025 !
Research Highlights
Weak topological insulators
We discovered weak topological insulators (WTIs) Bi4I4 and Bi4Br2I2 using microscopic ARPES. WTIs exhibit highly-directional spin currents on the side surfaces of crystals.
Manipulating Rashba effects
Rashba effects in MBE-grown quantum well films Ag/Au(111) were controlled utilizing thickness-dependence. A simple scaling law explains this behavior.
Coherent phonons under Floquet driving
We studied coherent phonon generation under Floquet driving in a layered antiferromagnet MnPS3 using ultrafast broadband reflection spectroscopy.
SpecTopo Lab 