Title of article :
Observation of coherent higher frequency phonons in Bi2Se3 using femtosecond time-resolved reflection measurement
Author/Authors :
Nakamura، نويسنده , , Kazutaka G. and Hu، نويسنده , , Jianbo and Norimatsu، نويسنده , , Katsura and Goto، نويسنده , , Arihiro and Igarashi، نويسنده , , Kyushiro and Sasagawa، نويسنده , , Takao، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Abstract :
The dynamics of phonons in a Bi2Se3 crystal has been studied by using femtosecond time-resolved reflection measurements. Two coherent optical phonons with A 1 g 1 and A 1 g 2 modes are observed at 2.14 and 5.09 THz at room temperature, respectively. The initial amplitude of the generated coherent A 1 g 2 phonons is higher than that of the A 1 g 1 phonons, but those are quickly damped with a rate of 1.28 THz.
Keywords :
A. Thermoelectric materials , A. Topological insulators , D. Coherent phonons , E. Transient reflectivity
Journal title :
Solid State Communications
Journal title :
Solid State Communications
