Citation:
A. M.-T. Kim, C. A. D. Roeser, and E. Mazur. 2003. “Modulation of the Bonding-Antibonding Splitting in Te by Coherent Phonons.” Phys. Rev. B, 68, Pp. 012301–012304. Publisher's Version
Abstract:
We present femtosecond time-resolved measurements of the dielectric tensor of tellurium following intense photoexcitation. Strong impulsive photoexcitation of crystalline tellurium weakens the covalent bonds between atoms, which undergo coherent oscillations (at > 3 THz) as they relax to new equilibrium positions. As this photoexcitation drives the lattice toward a band-crossing transition, we track the decrease and oscillation of the bonding-antibonding splitting. The reduction of the bonding-antibonding splitting exceeds the band gap for 100 fs, indicating a transient state with crossed bands.See also: Ultrafast dynamics in solids