Extreme phonon softening in laser-excited Bismuth - towards an inverse Peierls-transition
In: MRS Proceedings, Vol. 1230E (2010), pp. 3 - 5
2010article/chapter in journal
Physics (incl. Astronomy)Faculty of Physics » Experimental Physics
Title:
Extreme phonon softening in laser-excited Bismuth - towards an inverse Peierls-transition
Author:
Lu, WeiUDE
- LSF ID
- 12041
- ORCID
- 0000-0002-2573-5738
- Other
- connected with university
- LSF ID
- 10430
- Other
- connected with university
- LSF ID
- 10438
- ORCID
- 0000-0003-3451-1979
- Other
- connected with university
- LSF ID
- 50189
- Other
- connected with university
- GND
- 1201039908
- LSF ID
- 10366
- ORCID
- 0000-0003-0324-3457
- Other
- connected with university
- GND
- 121993092X
- LSF ID
- 10402
- ORCID
- 0000-0001-5618-3879
- Other
- connected with university
- GND
- 172725364
- LSF ID
- 13459
- ORCID
- 0000-0002-7979-5357
- Other
- connected with university
Year of publication:
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.