A piece of femto-galaxy - 이민철.jpg
"A piece of femto-galaxy"

by Min-Cheol Lee (Center for Correlated Electron Systems, IBS)

1st prize awarded in "2018 IBS Art in Science"

A single crystalline Ca2RuO4, destroyed by an ultrafast laser beam, is modeled as a workpiece. The broken crystal shows a clear line along the path of the femtosecond laser pulse incident on the sample. Unlike conventional techniques, ultrafast spectroscopy can instantaneously introduce a large amount of energy by using femtosecond light. Particularly in the case of Ca2RuO4 with a strong correlation between electronic/lattice structures, huge structural changes can arise, such that the sample is destroyed not by physical contact but merely by the absorption of ultrafast light. The millimeter-sized black sample with red glue reminds me of a vast galaxy in the night sky.
Frontispiece of
Advanced Materials

Volume 30, Issue 42

Special Issue: Materials Research at Seoul National University

"Metal‐Insulator Transition:
Spectroscopic Studies on the Metal–Insulator Transition Mechanism in Correlated Materials"

designed by

Min-Cheol Lee, So Yeun Kim and Changyoung Kim

(Center for Correlated Electron Systems, IBS)

worked by 

SangJoon Choi (


Spectroscopic approaches to metal–insulator‐transition phenomena with incident and reflected light as well as photoemitted electrons are discussed by Changyoung Kim and co‐workers in article number 1704777. A correlated material with a periodic electronic potential in its insulating state (blue region) with localized electrons, and in metallic state (red region) is depicted.


- Frontipiece

- Paper