Dynamics and coherent control of high-amplitude optical phonons in bismuth

DeCamp, Matthew F.; Reis, David A.; Bucksbaum, P. H.; Merlín, R.

doi:10.1103/physrevb.64.092301

Cited by 149 publications

(115 citation statements)

References 18 publications

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“…This non linearity indicates that in this regime the atoms may displace in a stronger anharmonic regime. On the other hand, increasing the fluence results in a red shift of the phonon frequency, as it can be observed in figure 6, in agreement with previous findings (DeCamp, 2001;Murray, 2005). This can be explained again by the fact that increasing the fluence, the density of electrons excited into the conduction band increases as well, resulting in a softening of the interatomic bonding.…”

Section: Bismuth Crystalsupporting

confidence: 81%

Coherent Optical Phonons in Bismuth Crystal

Boschetto¹,

Rousse²

2010

Coherence and Ultrashort Pulse Laser Emission

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Section: Bismuth Crystalsupporting

confidence: 81%

Coherent Optical Phonons in Bismuth Crystal

Boschetto¹,

Rousse²

2010

Coherence and Ultrashort Pulse Laser Emission

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“…Recently there has been considerable interest in the dynamics of the A 1g mode in the limit of a dense electronhole plasma, particularly for bismuth [21][22][23][24][25][26][27][28][29] . Hase et al 24 observed that the frequency of the mode is impulsively softened and chirped toward the equilibrium value over a few picoseconds.…”

Section: Introductionmentioning

confidence: 99%

Free-carrier relaxation and lattice heating in photoexcited bismuth

et al. 2013

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We report ultrafast surface pump and interface probe experiments on photoexcited carrier transport across single crystal bismuth films on sapphire. The film thickness is sufficient to separate carrier dynamics from lattice heating and strain, allowing us to investigate the time-scales of momentum relaxation, heat transfer to the lattice and electron-hole recombination. The measured electron-hole (e − h) recombination time is 12-26 ps and ambipolar diffusivity is 18-40 cm 2 /s for carrier excitation up to ∼ 10 19 cm −3 . By comparing the heating of the front and back sides of the film, we put lower limits on the rate of heat transfer to the lattice, and by observing the decay of the plasma at the back of the film, we estimate the timescale of electron-hole recombination. We interpret each of these timescales within a common framework of electron-phonon scattering and find qualitative agreement between the various relaxation times observed. We find that the carrier density is not determined by the e − h plasma temperature after a few picoseconds. The diffusion and recombination become nonlinear with initial excitation > ∼ 10 20 cm −3 .

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“…Coherent phonons are widely used to study phonon dynamics for a wide variety of materials such as semimetals, [1][2][3][4][5] semiconductors, [6][7][8][9][10][11][12][13] superconductors, [14][15][16][17] and topological insulators, [18][19][20][21] with pump-probe type time-resolved reflectivity measurements. An ultrashort pump pulse coherently excites optical phonons which oscillate in phase and modulate the electric susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Influence of pulse width and detuning on coherent phonon generation

2015

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We investigated the coherent phonon generation mechanism by irradiation of an ultrashort pulse with a simple two-level model. Our derived formulation shows that both impulsive stimulated Raman scattering (ISRS) and impulsive absorption (IA) simultaneously occur and phonon wave packets are generated in the electronic ground and excited states by ISRS and IA, respectively. We identify the dominant process from the amplitude of the phonon oscillation. For short pulse widths, the ISRS is very small and becomes larger as the pulse width increases. We also show that the initial phase is dependent on the pulse width and the detuning.

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Dynamics and coherent control of high-amplitude optical phonons in bismuth

Cited by 149 publications

References 18 publications

Coherent Optical Phonons in Bismuth Crystal

Coherent Optical Phonons in Bismuth Crystal

Free-carrier relaxation and lattice heating in photoexcited bismuth

Influence of pulse width and detuning on coherent phonon generation

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