Extreme phonon softening in laser-excited Bismuth - towards an inverse Peierls-transition
In: MRS Proceedings, Band 1230E (2010), S. 3 - 5
2010Artikel/Aufsatz in Zeitschrift
Physik (inkl. Astronomie)Fakultät für Physik » Experimentalphysik
Titel:
Extreme phonon softening in laser-excited Bismuth - towards an inverse Peierls-transition
Autor*in:
Lu, WeiUDE
- LSF ID
- 12041
- ORCID
- 0000-0002-2573-5738
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- LSF ID
- 10430
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- LSF ID
- 10438
- ORCID
- 0000-0003-3451-1979
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- LSF ID
- 50189
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 1201039908
- LSF ID
- 10366
- ORCID
- 0000-0003-0324-3457
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 121993092X
- LSF ID
- 10402
- ORCID
- 0000-0001-5618-3879
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
- GND
- 172725364
- LSF ID
- 13459
- ORCID
- 0000-0002-7979-5357
- Sonstiges
- der Hochschule zugeordnete*r Autor*in
Erscheinungsjahr:
2010
Abstract:
Large amplitude coherent optical phonons have been investigated in laser-excited Bismuth by means of femtosecond time-resolved X-ray diffraction. For absorbed laser fluences above 2 mJ/cm2, the experimental data reveal an extreme softening of the excited A1g-mode down to frequencies of about 1 THz, only 1/3 of the unperturbed A1g-frequency. At even stronger excitation the measured diffraction signals no longer exhibit an oscillatory behavior presenting strong indication that upon intense laser-excitation the Peierls-distortion, which defines the equilibrium structure of Bismuth, can be transiently reversed.