Lu, Wei; Nicoul, Matthieu; Shymanovich, Uladzimir; Tarsevitch, Alexander; Kammler, Martin; Horn-von Hoegen, Michael; von der Linde, Dietrich; Sokolowski-Tinten, Klaus:
Extreme phonon softening in laser-excited Bismuth - towards an inverse Peierls-transition
2010
In: MRS Proceedings, Band 1230E (2010), S. 3 - 5
Artikel/Aufsatz in Zeitschrift2010Physik
Fakultät für Physik » Experimentalphysik
Titel:
Extreme phonon softening in laser-excited Bismuth - towards an inverse Peierls-transition
Autor(in):
Lu, WeiLSF; Nicoul, MatthieuLSF; Shymanovich, UladzimirLSF; Tarsevitch, Alexander; Kammler, MartinLSF; Horn-von Hoegen, MichaelLSF; von der Linde, DietrichLSF; Sokolowski-Tinten, KlausLSF
Erscheinungsjahr
2010
WWW URL

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.