Title :
Dynamics of coherent optical phonons in a Bi2Se3 crystal
Author :
Norimatsu, Katsura ; Hu, Jianbo ; Goto, Arihiro ; Igarashi, Kyushiro ; Sasagawa, Takao ; Nakamura, Kazutaka G.
Author_Institution :
Mater. & Struct. Lab., Tokyo Inst. of Technol., Yokohama, Japan
Abstract :
Coherent A1g1, A1g2, and Eg2 phonons in Bi2Se3 are observed using ultrafast spectroscopy. Their initial phases suggest different coupling strengths with photo-excited electrons. Their decay rates per oscillations are almost the same.
Keywords :
bismuth compounds; electron-phonon interactions; high-speed optical techniques; oscillations; photoexcitation; photoreflectance; semiconductor materials; stimulated Raman scattering; time resolved spectra; coherent A1g1 phonons; coherent A1g2 phonons; coherent Eg2 phonons; coherent optical phonon dynamics; coupling strengths; decay rates; electron-phonon couplings; femtosecond time-resolved reflection measurement; oscillations; photoexcited electrons; semiconductor materials; stimulated Raman scattering; ultrafast spectroscopy; Crystals; Laser beams; Measurement by laser beam; Oscillators; Phonons; Reflectivity; Ultrafast optics;
Conference_Titel :
Lasers and Electro-Optics (CLEO), 2012 Conference on
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4673-1839-6
