Advanced optical spectroscopy
Research Field
Prof. Hsiang-Lin Liu received his Ph.D. in Physics from the University of Florida, Gainesville in 1997, and then served as a postdoctoral researcher at the University of Illinois Urbana-Champaign. In 1999, he joined the Department of Physics at National Taiwan Normal University (NTNU) and was promoted to full professor in 2006. Furthermore, Prof. Liu has held several administrative positions at NTNU, including Vice President for International Affairs, Associate Vice President for Academic Affairs, Director of the Center for Teaching and Learning Development, and Chair of the Department of Physics. Prof. Liu enjoys swimming, jogging, and reading in his spare time.
We employ optical spectroscopic techniques to study the vibrational and electronic excitations of novel quantum materials. We concentrate on two-dimensional materials and strongly correlated electron systems rather than traditional materials, such as conventional metals or semiconductors. Our primary techniques are THz, infrared, Raman, optical, and ellipsometric spectroscopies.
We are interested in studying the electron-phonon coupling, the nature of excitons, and the broken symmetry ground state in two-dimensional materials such as graphene, layered transition metal dichalcogenides, and hexagonal boron nitride. We are also interested in investigating the nature and origin of various novel quantum phenomena in strongly correlated electron systems and characterizing the excitation spectra in the mix of unusual magnetic order, enhanced electron interactions, and strong spin fluctuations that accompany the transition. We aim to use our understanding of the quantum phase transition mechanisms in exotic solid-state electronic and magnetic systems to design new devices with novel material properties.
International keynote and invited talks
- February 20, 2023, Workshop in honor of Prof. Millie and Gene Dresselhaus and Celebrating the retirement of Prof. Riichiro Saito, Boston, USA, Invited Speaker: DUV Raman studies of two-dimensional materials.
- October 12, 2022, Taiwan-Japan International Symposium on Raman spectroscopy, Tokyo, Japan, Invited Speaker: Exploring the deep-ultraviolet vibrational and electronic excitations of monolayer graphene.
- September 1, 2022, The 63rd Fullerenes-Nanotubes-Graphene General Symposium, Tokyo, Japan, Invited Speaker: Exploring the deep-ultraviolet vibrational and electronic excitations of monolayer graphene.
- November 4, 2021, The 1st International Conference on Sciences Development and Technology, Medan, Indonesia, Keynote Speaker: Two-dimensional materials: Prospects and Challenges.
- November 6, 2019, The 4th International Symposium of Current Progress in Functional Materials, Bali, Indonesia, Keynote Speaker: Two-dimensional materials: Prospects and Challenges.
- August 28, 2018, The 26th International Conference on Raman Spectroscopy, Jeju Island, Korea, Invited Speaker: Deep-ultraviolet Raman scattering studies of two-dimensional materials.
- May 24, 2018, Japan/Taiwan International Symposium on Raman Spectroscopy, Tokyo, Japan, Invited Speaker: Resonant Raman scattering studies of two-dimensional materials.
- May 20, 2017, The 6th National Physics Seminar Faculty of Mathematics and Sciences State University of Jakarta, Jakarta, Indonesia, Keynote Speaker: Advances in Physics and Beyond.
- December 1, 2016, Global Photonics 2016, Osaka, Japan, Invited Speaker: Deep-ultraviolet Raman scattering studies of two-dimensional materials.
- November 13, 2015, Joint International Symposium on Mathematics and Physics, 20th Rev. Fr. Ciriaco Pedrosa, O.P. Memorial Lecture Series, Philippines, Invited Speaker: Optical properties of novel monolayer materials.
- November 7, 2014, SKKU International Symposium on recent progress in Physics for the 60th anniversary of Physics Department, Korea, Invited Speaker: THz response of graphene-based materials.
- October 5, 2012, The 2nd International Conference of Asia Union of Magnetic Societies, Japan, Invited Speaker: Effect of magnetic field on the optical properties in graphite nanoplatelet films.
- April 22, 2011, WHMFC The International Workshop on Frontier Science in Pulsed High Magnetic Fields, China, Invited Speaker: Magneto-spectroscopy studies of graphite nanoplatelet films.
- March 20, 2000, APS March Meeting 2000, Minneapolis, U. S. A., Invited Speaker: Optical studies of charge ordering and 2-phase behavior in manganites.
- February 21, 2000, The 6th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors, Houston, U. S. A., Invited Speaker: Electronic Raman scattering in Bi2Sr2CaCu2O8+δ excited with c-axis polarized light.
- Ph.D. in Physics, Department of Physics, University of Florida, USA (1993-1997)
- MS in Physics, Department of Physics, National Tsing Hua University, Taiwan (1988-1990)
- BS in Physics, Department of Physics, Tamkang University, Taiwan (1984-1988)
2 Vacancies
Job Description
For many of these practical applications, knowledge and the lattice dynamics and electronic band structure of layered quantum materials is important not only to characterize the structure but also to understand the optical and electronic properties of devices. Optical spectroscopy is an effective tool for probing such properties of layered quantum materials, providing critical information about the phononic and electronic excitations in these systems. Our primary techniques are THz, infrared, Raman, optical, and ellipsometric spectroscopies. The internship student will collect optical measurements, analyze the data, and write up the first draft of the paper.
Preferred Intern Education Level
The educational background required is that of either an undergraduate or a master's degree student.
Skill sets or Qualities
English proficiency certificate at CEFR Levels B2 (or above)