Direct and real-time observation of hole transport dynamics in anatase TiO2 using X-ray free-electron laser

Autor: Sang Han Park, Abhishek Katoch, Keun Hwa Chae, Sanjeev Gautam, Piter Miedema, Sang Wan Cho, Minseok Kim, Ru-Pan Wang, Masoud Lazemi, Frank de Groot, Soonnam Kwon

Publikováno v: Nature Communications, Vol 13, Iss 1, Pp 1-9 (2022)

Direct and real-time observation of the excess holes in an element-specific and energylevel-specific manner is a challenging task. Here the authors present a complete hole dynamics of photo-excited anatase TiO2 with 100 femto-second resolution.

Externí odkaz: https://doaj.org/article/7c0f369caeaa4b41b0ebb7a4cd83c5f7

Recent Progress of the PAL-XFEL

Autor: Intae Eom, Sae Hwan Chun, Jae Hyuk Lee, Daewoong Nam, Rory Ma, Jaehyun Park, Sehan Park, Sang Han Park, Haeryong Yang, Inhyuk Nam, Myung Hoon Cho, Chi Hyun Shim, Gyujin Kim, Chang-Ki Min, Hoon Heo, Heung-Sik Kang, Changbum Kim

Publikováno v: Applied Sciences, Vol 12, Iss 3, p 1010 (2022)

The X-ray free-electron laser of the Pohang Accelerator Laboratory (PAL-XFEL) was opened to users in 2017. Since then, significant progress has been made in PAL-XFEL operation and beamline experiments. This includes increasing the FEL pulse energy, i

Externí odkaz: https://doaj.org/article/bb611734d6be4c53bb565457febe3791

Ultrafast X-ray imaging of the light-induced phase transition in VO2

Autor: Allan S. Johnson, Daniel Perez-Salinas, Khalid M. Siddiqui, Sungwon Kim, Sungwook Choi, Klara Volckaert, Paulina E. Majchrzak, Søren Ulstrup, Naman Agarwal, Kent Hallman, Richard F. Haglund, Christian M. Günther, Bastian Pfau, Stefan Eisebitt, Dirk Backes, Francesco Maccherozzi, Ann Fitzpatrick, Sarnjeet S. Dhesi, Pierluigi Gargiani, Manuel Valvidares, Nongnuch Artrith, Frank de Groot, Hyeongi Choi, Dogeun Jang, Abhishek Katoch, Soonnam Kwon, Sang Han Park, Hyunjung Kim, Simon E. Wall

Publikováno v: Johnson, A S, Perez-Salinas, D, Siddiqui, K, Kim, S, Choi, S, Volckaert, K, Majchrzak, P E, Ulstrup, S, Agarwal, N, Hallman, K A, Haglund, R F, Günther, C M, Pfau, B, Eisebitt, S, Backes, D, Maccherozzi, F, Fitzpatrick, A, Dhesi, S S, Gargiani, P, Valvidares, M, Artrith, N, de Groot, F, Choi, H, Jang, D, Katoch, A, Kwon, S, Park, S H, Kim, H & Wall, S E 2023, ' Ultrafast X-ray imaging of the light-induced phase transition in VO2 ', Nature Physics, vol. 19, pp. 215 . https://doi.org/10.1038/s41567-022-01848-w
Johnson, A S, Perez-Salinas, D, Siddiqui, K M, Kim, S, Choi, S, Volckaert, K, Majchrzak, P E, Ulstrup, S, Agarwal, N, Hallman, K, Haglund, R F, Günther, C M, Pfau, B, Eisebitt, S, Backes, D, Maccherozzi, F, Fitzpatrick, A, Dhesi, S S, Gargiani, P, Valvidares, M, Artrith, N, de Groot, F, Choi, H, Jang, D, Katoch, A, Kwon, S, Park, S H, Kim, H & Wall, S E 2023, ' Ultrafast X-ray imaging of the light-induced phase transition in VO 2 ', Nature Physics, vol. 19, no. 2, pp. 215-220 . https://doi.org/10.1038/s41567-022-01848-w

Using light to control transient phases in quantum materials is an emerging route to engineer new properties and functionality, with both thermal and non-thermal phases observed out of equilibrium. Transient phases are expected to be heterogeneous, e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::635ec0caae20f9fe2711c1f2b7206fbc

Femtosecond soft X-ray absorption spectroscopy of warm dense matter at the PAL-XFEL

Autor: Gyeongbo Kang, Jong Won Lee, Sang Han Park, Minseok Kim, Soonnam Kwon, Seonghyeok Yang, Byoung-ick Cho, Minju Kim

Publikováno v: Journal of Synchrotron Radiation. 27:953-958

Free-electron laser pulse-based X-ray absorption spectroscopy measurements on warm dense copper are presented. The incident X-ray pulse energies were measured with a detector assembly consisting of a photocathode membrane and microchannel plates, and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a049e415061880eef497150fd9a2437
https://doi.org/10.1107/s160057752000524x

Direct and real-time observation of hole transport dynamics in anatase TiO

Autor: Sang Han, Park, Abhishek, Katoch, Keun Hwa, Chae, Sanjeev, Gautam, Piter, Miedema, Sang Wan, Cho, Minseok, Kim, Ru-Pan, Wang, Masoud, Lazemi, Frank, de Groot, Soonnam, Kwon

Publikováno v: Nature communications. 13(1)

Carrier dynamics affects photocatalytic systems, but direct and real-time observations in an element-specific and energy-level-specific manner are challenging. In this study, we demonstrate that the dynamics of photo-generated holes in metal oxides c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::535169c46eda90a3ee03d8861cc41a85
https://pubmed.ncbi.nlm.nih.gov/35534509