Quantum oscillations caused by laser pulses in layered ε-GaSe
Allakhverdiev K. , Kamassel Dzh. , Kurz H. , Mustafaev N., Tagiev M. , Salaev E. , Siebert K.
The oscillations with a period of 248 fs which have been observed (for the first time) in the optical transmission spectra of ^-GaSe subjected to laser pulses 60 fs long with an energy of 1.68 eV are explained under the assumption of a coherent excitation of A \ nonpolar optical phonons (134.6cm-1 ).