About NSRRC / Staff Directory

Name: Chen, Chien-Te
EXT.: 7308
E-mail: ctchen@nsrrc.org.tw
  • Ph.D.    in Physics, University of Pennsylvania, Philadelphia, PA, USA, 1985
  • Sc.M.    in Physics, National Taiwan University, Taipei, Taiwan, 1980
  • B. S.     in Physics, National Taiwan University, Taipei, Taiwan, 1976
  • Distinguished Scientist, National Synchrotron Radiation Research Center, Taiwan, 1997-2023
  • Scientist, National Synchrotron Radiation Research Center, Taiwan, 1995-1997
  • Experimental Physicist and Group Leader of Soft X-ray Spectroscopy, AT&T Bell Labs, USA, 1985-1995
  • Spokesperson of NSLS-U4B “the Dragon” beamline, USA, 1988-1995
  • Director and Acting Director, National Synchrotron Radiation Research Center, Taiwan, 1997-2005 and 2010
  • Deputy Director, National Synchrotron Radiation Research Center, Taiwan, 1995-1997
  • Member and Executive Member of the Board of Trustees, National Synchrotron Radiation Research Center, Taiwan, 2003-2006; 2009-present
  • Director General, Taiwan Photon Source Synchrotron Construction Project, 2010-2014
  • Chief Adviser, Taiwan Photon Source Synchrotron Construction Project, 2009 & 2015.
  • Adjunct Professor, Department of Physics, National Chung Cheng University, Taiwan, 1999-2020
  • Adjunct Professor, Department of Physics, National Taiwan University, Taiwan, 1998-2005
  • Chair of the Proposal Review Committee for Synchrotron Radiation Research, National Science Council, Taiwan, 1995-1997
  • Council, the Physical Society of Taiwan, 1998-2003
  • International Advisory Committee of Synchrotron Radiation Facilities: ALS in USA, SSRF in China, Elettra in Italy, and PLS in Korea
  • Many other sciences related committee services
  • Honors and Awards: The Werner Teutsch Memorial Prize, Univ. of Penn., USA, 1981 / First Annual Dean's Scholar Award, SAS, Univ. of Penn., USA, 1984 / R&D 100 Award, USA, 1988 / AT&T Bell Laboratories ECA Award, USA, 1987-1995 / Endowment Chair, Foundation for the Advancement of Outstanding Scholarship, Taiwan, 1995 / Fellow, American Physical Society, USA, 1996 / Academician, Academia Sinica, Taiwan, 2000 / Fellow, The Physical Society of Taiwan, 2001 / Fellow, The World Academy of Sciences (TWAS), 2007 / Special Contribution Award, The Physical Society of Taiwan, 2016 / Presidential Science Prize, Taiwan, 2017
Research Interests:
  • Microscopic electronic and magnetic structure of condensed matter
  • Soft X-ray spectroscopy and scattering
  • Synchrotron radiation instrumentation, beamline and end-station
  • Planning and construction of synchrotron accelerator
  • In 1985, Dr. Chen proposed at Bell Labs, USA, the cylindrical-element monochromator design for synchrotron radiation (SR), and in 1986-1987, constructed at NSLS-U4B port, the world’s first high-resolution, high-transmission soft X-ray beamline, dubbed “Dragon”.  During 1988, the beamline was used to measure the K-shell photoabsorption of condensed N2 to demonstrate, for the first time, that soft X-ray can reach an energy resolution (E/E) of 10-4, removing the fundamental impediment that had persisted for several decades in soft X-ray science.  Since then, the Dragon design has been extended to 4-2000 eV, which covers the entire UV, VUV, and soft X-ray spectral regions. Moreover, its resolution has reached 10-5 in VUV region.  Dr. Chen’s invention has now been adopted by 23 SR facilities in Taiwan, USA, Japan, France, Germany, UK, Italy, Sweden, Switzerland, Denmark, Canada, China, Korea, India, and Brazil.

    In 1987-1995, using the soft X-rays from the “Dragon” beamline and the photoelectron, photoabsorption, and magnetic circular dichroism (MCD) experimental stations designed and constructed by Dr. Chen et al., he and his co-workers has made many innovations in soft X-ray spectroscopic techniques, including high-resolution soft X-ray photoabsorption, high-resolution soft X-ray photoemission, high accuracy fluorescence yield linearly-polarized soft X-ray photoabsorption, and soft X-ray MCD.  In particular, the first soft X-ray MCD experiment carried out in 1989 has since then ignited a worldwide heatwave on soft X-ray MCD research for the past three decades.  Dr. Chen’s group has also developed the techniques for measuring element-specific three-dimensional magnetic hysteresis curves, electron orbital and spin magnetic moments, and interfacial magnetic coupling and magnetic roughness, thereby opening up new areas for research on magnetism and magnetic materials.  All these experimental techniques have become invaluable tools for probing the microscopic electronic and magnetic structure of matter.

    The purpose of developing these soft X-ray experimental techniques is to investigate the electronic and magnetic structure of matter.  Dr. Chen has investigated molecules in gas phase, surfaces/interfaces and adsorbates, semiconductors, transition metals and their compounds, high temperature superconducting cuprates (HTSC), magnetic surfaces and thin films, rare-earth ferri-magnets, alkali doped C60, colossal magnetoresistance manganese oxides (CMR), and heavy Fermion systems.  Among them, the high-accuracy experiments on HTSC, KxC60, CMR, and magnetic multilayers are the most influential.  These experiments have obtained conclusive data on the electronic or magnetic structure of these novel materials, removed major experimental controversies, helped to test the validity of various theories, and provided a reliable microscopic foundation for new theoretical models yet to come.

    After joining Taiwan’s National Synchrotron Radiation Research Center in 1995, Dr. Chen continues to do research in soft X-ray science.  In condensed matter physics, Dr. Chen has built a world class soft X-ray research group and experimental facility in Taiwan.  By using the advanced instrumentations developed by Dr. Chen, his group and international collaborators have completed many decisive experiments that provide new insights into important issues of condensed matter physics. In instrumentation development, he has invented the active-grating-monochromator-active-grating-spectrometer beamline system for inelastic soft X-ray scattering that has data a collection efficiency 100 times higher than that of the conventional designs; an octopole superconducting magnet that can produce strong magnetic field up to 4 Tesla in arbitrary 3D direction for large angle light scattering experiments; and an in-vacuum long-trace-profiler for measuring the slope of optical surface with a unprecedented repeatability of 0.005 μrad (rms). These cutting-edge instruments have attracted much attention internationally.
Selected Publications:
  • H. Y. Huang, A. Singh, C. Y. Mou, S. Johnston, A. F. Kemper, J. van den Brink, P. J. Chen, T. K. Lee, J. Okamoto, Y. Y. Chu, J. H. Li, S. Komiya, A. C. Komarek, A. Fujimori, C. T. Chen, and D. J. Huang, “Quantum Fluctuations of Charge Order Induce Phonon Softening in a Superconducting Cuprate,” Phys. Rev. X 11, 041038 (2021).
  • A. Amorese, B. Leedahl, M. Sundermann, H. Gretarsson, Z. Hu, H.-J. Lin, C. T. Chen, M. Schmidt, H. Borrmann, Y. Grin, A. Severing, M. W. Haverkort and L. H. Tjeng, “Selective Orbital Imaging of Excited States with X-Ray Spectroscopy: The Example of alpha-MnS,” Phys. Rev. X 11, 011002 (2021).
  • M. Han, Z. P. Liu, X. Shen, L. Yang, X. Shen, Q. H. Zhang, X. Z. Liu, J. Y. Wang, H.-J. Lin, C. T. Chen, C. W. Pao, J. L. Chen, Q. Y. Kong, X. Q. Yu, R. C. Yu, L. Gu, Z. W. Hu, X. F. Wang, Z. X. Wang and L. Q. Chen, “Stacking Faults Hinder Lithium Insertion in Li2RuO3,” Adv. Energy Mater. 10, 2002631 (2020).
  • M. Han, J. Y. Jiao, Z. P. Liu, X. Shen, Q. H. Zhang, H.-J. Lin, C. T. Chen, Q. Y. Kong, W. K. Pang, Z. P. Guo, R. C. Yu, L. Gu, Z. W. Hu, Z. X. Wang and L. Q. Chen, “Eliminating Transition Metal Migration and Anionic Redox to Understand Voltage Hysteresis of Lithium-Rich Layered Oxides,” Adv. Energy Mater. 10, 1903634 (2020).
  • Y. D. Liou, Y. Y. Chiu, R. T. Hart, C. Y. Kuo, Y. L. Huang, Y. C. Wu, R. V. Chopdekar, H.-J. Liu, A. Tanaka, C. T. Chen, C. F. Chang, L. H. Tjeng, Y. Cao, V. Nagarajan and Y. H. Chu, “Deterministic Optical Control of Room Temperature Multiferroicity in BiFeO3 Thin Films,” Nature Mater. 18, 580 (2019).
  • Y. L. Zhu, H. A. Tahini, Z. W. Hu, Z. G. Chen, W. Zhou, A. C. Komarek, Q. Lin, H.-J. Jin, C. T. Chen, Y. J. Zhong, M.T. Fernández-Díaz, S. C. Smith, H. T. Wang, M. L. Liu and Z. P. Shao, “Boosting Oxygen Evolution Reaction by Creating both Metal Ion and Lattice-oxygen Active Sites in a Complex Oxide,” Adv. Mater. 32, 1905025 (2019).
  • C. T. Chen, Y. U. Idzerda, H.-J. Lin, N. V. Smith, G. Meigs, E. Chaban, G. Ho, E. Pellegrin, and F. Sette, “Experimental Confirmation of the X-ray Magnetic Circular Dichroism Sum Rules for Iron and Cobalt,” Phys. Rev. Lett. 75, 152 (1995).
  • C. T. Chen, L. H. Tjeng, J. Kwo, H. L. Kao, P. Rudolf, F. Sette, and R. M. Fleming, “Out-of-plane Orbital Characters of Intrinsic and Doped Holes in    La2-xSrxCuO4,” Phys. Rev. Lett. 68, 2543 (1992)
  • C. T. Chen, L. H. Tjeng, P. Rudolf, G. Meigs, J. E. Rowe, J. Chen, J. P. McCauley Jr., A. B. Smith III, A. R. McGhie, W. J. Romanow, and E. W. Plummer, “Electronic States and Phases of KxC60 from Photoemission and X-ray Absorption Spectroscopy,” Nature 352, 603 (1991)
  • C. T. Chen, F. Sette, Y. Ma, M. S. Hybertsen, E. B. Stechel, W. M. C. Foulkes, M. A. Schluter, S-W. Cheong, A. S. Cooper, L. W. Rupp, Jr., B. Batlogg, Y. L. Soo, Z. H. Ming, A. Krol, and Y. H. Kao,  “Electronic States in La2-xSrxCuO4+δ Probed by Soft X-ray Absorption,” Phys. Rev. Lett. 66, 104 (1991).
  • C. T. Chen, F. Sette, Y. Ma, and S. Modesti, “Soft X-ray Magnetic Circular Dichroism at the L2,3 Edges of Nickel,” Phys. Rev. B 42, 7262 (1990).
  • C. T. Chen and F. Sette, “Performance of the Dragon Soft X-ray Beamline,” Rev. Sci. Instrum. 60, 1616 (1989).
  • C. T. Chen, “Concept and Design Procedure for Cylindrical Element Monochromators for Synchrotron Radiation,” Nucl. Instrum. Meth. A 256, 595 (1987). 
  • Published 461 SCI papers and 36 non-SCI papers (1984-2021)