Coherent energy exchange between carriers and phonons in Peierls-distorted bismuth unveiled by broadband XUV pulses

Coherent Excitation of Optical Phonons in GaAs by Broadband Terahertz Pulses

Coherent excitation and control of lattice motion by electromagnetic radiation in optical frequency range has been reported through variety of indirect interaction mechanisms with phonon modes. However, coherent phonon excitation by direct interaction of electromagnetic radiation and nuclei has not been demonstrated experimentally in terahertz (THz) frequency range mainly due to the lack of THz...

Observation of coherent acoustic and optical phonons in bismuth nanowires by a femtosecond pump-probe technique

Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were me...

Maximizing the amplitude of coherent phonons with shaped laser pulses

Coherent excitation of shake-up states in rare gas atoms by attosecond xuv pulses

In a recent experiment [2], Uiberacker et al. exposed neon atoms to a phase-stabilized fewcycle infrared (IR) laser field and a synchronized attosecond XUV pulse. The XUV pulse leads to single ionization of the Ne atom and the creation of excited (shake-up) states in the residual Ne ion. The IR pulse can then further ionize the Ne ion, thus serving as a probe for the quantum state of the singly...

Origin of coherent phonons in Bi2Te3 excited by ultrafast laser pulses

Femtosecond laser pulses are used to excite coherent optical phonons in single crystal Bi2Te3 thin films. Oscillations from lowand high-frequency A1g phonon modes are observed. A perturbation model based on molecular dynamics reveals various possibilities of phonon generation due to complex interactions among different phonon modes. In order to elucidate the process of phonon generation, measur...