Electronic Structure

Homepage: http://ares.snu.ac.kr

[Group Introduction]

The Electronic Structure Group, led by Prof. Changyoung Kim, is the third group to be established within the IBS Center for Correlated Electron Systems. The research of our group covers electronic structure studies of strongly correlated electron systems such as high Tc superconductors, transition metal oxides and materials with strong spin-orbit coupling (SOC), with a focus on orbital degrees of freedom. The group currently consists of three teams of Surface Phenomena team, Bulk Phenomena team and Superconductor/Oxide team.

The Electronic Structures group uses novel and advanced spectroscopic techniques to study the electronic structures of solids. Our main tool is the angle resolved photoelectron spectroscopy (ARPES) which provides us with direct information on the electronic structures of materials such as band dispersions and Fermi surfaces. State of the art ARPES systems at various Synchrotron facilities around the world are used. We also have a home-lab based ARPES system with in-situ sample growth capability. In addition, we plan on building a laser and discharge lamp based ultra-high resolution ARPES system.

Selected Publications

  • Yeong Kwan Kim, Yoon Young Koh, Wonshik Kyung, Garam Han, Kee Hoon Kim, Jongmok Ok, Junsung Kim, Matsunami Arita, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Sung-Kwan Mo, Changyoung Kim, Possible role of bonding angle and orbital mixing in iron pnictide superconductivity: Comparative electronic structure studies of LiFeAs and Sr2VO3FeAs, Physical Review B 92, 041116 (2015)
  • Yeong Kwan Kim, Wonsig Jung, Garam Han, Kiyoung Choi, Keehoon Kim, Chengchien Chen, Thomas Peter Devereaux, Ashish Chainani, Jun Miyawaki, Yasutaka Takata, Yoshikazu Tanaka, Masaki Oura, Shik Shin, Abhinav Pratap Singh, Honggi Lee, Jae-Young Kim, Changyoung Kim, Existence of orbital order and its fluctuation in superconducting Ba(Fe1-xCox)2As2 single crystals revealed by x-ray absorption spectroscopy, Physical Review Letters 111, 217001 (2013)
  • Beomyoung Kim, Panjin Kim, Wonsig Jung, Yeong Kwan Kim, Yoong Young Koh, Wonshik Kyung, Joonbum Park, Masaharu Matsunami, Shinichi Kimura, Joonsung Kim, Junghoon Han, Changyoung Kim, Microscopic mechanism for asymmetric charge distribution in Rashba-type surface states and the origin of the energy splitting scale, Physical Review B 88, 205408 (2013).
  • Seung Ryong Park, Jinhee Han, Chul Kim, Yoon Young Koh, Changyoung Kim, Hyungjun Lee, Kyungdong Lee, Namjung Hur, Masashi Arita, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Chiral orbital-angular momentum in the surface states of Bi2Se3, Physical Review Letters 108, 046805 (2012).
  • Seung Ryong Park, Choong Hyun Kim, Jaejun Yu, Junghoon Han, Changyoung Kim, Orbital-angular-momentum based origin of rashba-type surface band splitting, Physical Review Letters 107, 156803 (2011).