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Extreme Phonon Softening in Laser-excited Bismuth – Towards an Inverse Peierls-transition

  • Wei Lu (a1), Matthieu Nicoul (a2), Uladzimir Shymanovich (a3), Alexander Tarsevitch (a4), Martin Kammler (a5), Michael Horn-von Hoegen (a6), Dietrich von der Linde (a7) and Klaus Sokolowski-Tinten (a8)...

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.

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7Shymanovich, U. et al. , Appl. Phys. B92, 493 (2008).
8Murray, E. D. et al. , Phys. Rev. B72, 060301 (2005), ibd. 75, 184301 (2007).
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  • EISSN: 1946-4274
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