Non-thermal phase transitions in semiconductors under femtosecond XUV irradiation

Nikita A. Medvedev, Harald Olaf Jeschke, Beata Ziaja

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

When a semiconductor or a dielectric is irradiated with ultrashort intense X-ray pulse, several processes occur: first the photoabsorption brings the electron subsystem out of equilibrium, bringing valence or deeper shells electrons into high energy states of the conduction band. Then, secondary electron cascading promotes further electrons of the valence to conduction band increasing their number there. These electrons also influence the atomic motion, modifying the interatomic forces. This process is known as a nonthermal melting. It can turn a material into a new phase state on ultrashort timescales. Recently developed hybrid model for treating all of these processes with different computational tools was reported in [N. Medvedev et al, New J. Phys. 15, 015016 (2013)]. Based on this model, we present here further investigations of nonthermal processes occurring in diamond under irradiation with a FLASH pulse of 10 fs FWHM and 92 eV photon energy. It is shown that the diamond turns into graphite under such irradiation, independently whether constant pressure or constant volume modeling is performed. However, for the latter case, the time of the nonthermal phase transition is longer (few tens of fs for P=const vs few hundreds of fs for V=const) and the damage threshold is slightly higher (0.69 eV/atom vs 0.74 eV/atom, correspondingly).

Original languageEnglish
Title of host publicationDamage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics
Subtitle of host publicationSynergy Between Laboratory and Space III
Volume8777
DOIs
Publication statusPublished - 2013
Externally publishedYes
EventDamage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III - Prague, Czech Republic
Duration: Apr 15 2013Apr 18 2013

Other

OtherDamage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III
CountryCzech Republic
CityPrague
Period4/15/134/18/13

Fingerprint

Femtosecond
Irradiation
Semiconductors
Phase Transition
Phase transitions
Electron
Semiconductor materials
irradiation
Electrons
Diamond
conduction bands
Conduction bands
Strombus or kite or diamond
electrons
Conduction
diamonds
Diamonds
valence
interatomic forces
photoabsorption

Keywords

  • Free-Electron Laser FLASH
  • Graphitization of diamond
  • Nonthermal melting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Medvedev, N. A., Jeschke, H. O., & Ziaja, B. (2013). Non-thermal phase transitions in semiconductors under femtosecond XUV irradiation. In Damage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III (Vol. 8777). [877709] https://doi.org/10.1117/12.2019123

Non-thermal phase transitions in semiconductors under femtosecond XUV irradiation. / Medvedev, Nikita A.; Jeschke, Harald Olaf; Ziaja, Beata.

Damage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III. Vol. 8777 2013. 877709.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Medvedev, NA, Jeschke, HO & Ziaja, B 2013, Non-thermal phase transitions in semiconductors under femtosecond XUV irradiation. in Damage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III. vol. 8777, 877709, Damage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III, Prague, Czech Republic, 4/15/13. https://doi.org/10.1117/12.2019123
Medvedev NA, Jeschke HO, Ziaja B. Non-thermal phase transitions in semiconductors under femtosecond XUV irradiation. In Damage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III. Vol. 8777. 2013. 877709 https://doi.org/10.1117/12.2019123
Medvedev, Nikita A. ; Jeschke, Harald Olaf ; Ziaja, Beata. / Non-thermal phase transitions in semiconductors under femtosecond XUV irradiation. Damage to VUV, EUV, and X-Ray Optics IV; and EUV and X-Ray Optics: Synergy Between Laboratory and Space III. Vol. 8777 2013.
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