Dispersion of optical and acoustic phonons in diamond and germanium crystals

Горелик, В. С.; Vasil'ev, N. S.

doi:10.1134/s0020168512050068

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…We now discuss possible origins of the anomalous spatial propagation at room temperature. First, we note that the measured propagation velocity is orders of magnitude larger than typical values for both optical phonons, which are commonly characterized by rather flat energy dispersions, and acoustic phonons, whose velocity is typically below 10 3 m/s (34). This suggests that the propagating signal does not have a purely phononic origin.…”

Section: Discussionmentioning

confidence: 77%

Imaging the coherent propagation of collective modes in the excitonic insulator Ta ₂ NiSe ₅ at room temperature

et al. 2021

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Excitonic insulators host a condensate of electron-hole pairs at equilibrium, giving rise to collective many-body effects. Although several materials have emerged as excitonic insulator candidates, evidence of long-range coherence is lacking and the origin of the ordered phase in these systems remains controversial. Here, using ultrafast pump-probe microscopy, we investigate the possible excitonic insulator Ta2NiSe5. Below 328 K, we observe the anomalous micrometer-scale propagation of coherent modes at velocities of ~105 m/s, which we attribute to the hybridization between phonon modes and the phase mode of the condensate. We develop a theoretical framework to support this explanation and propose that electronic interactions provide a substantial contribution to the ordered phase in Ta2NiSe5. These results allow us to understand how the condensate’s collective modes transport energy and interact with other degrees of freedom. Our study provides a unique paradigm for the investigation and manipulation of these properties in strongly correlated materials.

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Section: Discussionmentioning

confidence: 77%

Imaging the coherent propagation of collective modes in the excitonic insulator Ta ₂ NiSe ₅ at room temperature

et al. 2021

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Experimental observation of anharmonic effects in coherent phonon dynamics in diamond

Zukerstein

Kozák

Trojánek

et al. 2018

Diamond and Related Materials

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Raman scattering in diamond nano- and microcrystals, synthesized at high temperatures and high pressures

Горелик

Pyatyshev

2020

Diamond and Related Materials

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Dispersion of optical and acoustic phonons in diamond and germanium crystals

Cited by 3 publications

References 9 publications

Imaging the coherent propagation of collective modes in the excitonic insulator Ta ₂ NiSe ₅ at room temperature

Imaging the coherent propagation of collective modes in the excitonic insulator Ta ₂ NiSe ₅ at room temperature

Experimental observation of anharmonic effects in coherent phonon dynamics in diamond

Raman scattering in diamond nano- and microcrystals, synthesized at high temperatures and high pressures

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Dispersion of optical and acoustic phonons in diamond and germanium crystals

Cited by 3 publications

References 9 publications

Imaging the coherent propagation of collective modes in the excitonic insulator Ta 2 NiSe 5 at room temperature

Imaging the coherent propagation of collective modes in the excitonic insulator Ta 2 NiSe 5 at room temperature

Experimental observation of anharmonic effects in coherent phonon dynamics in diamond

Raman scattering in diamond nano- and microcrystals, synthesized at high temperatures and high pressures

Contact Info

Product

Resources

About

Imaging the coherent propagation of collective modes in the excitonic insulator Ta ₂ NiSe ₅ at room temperature

Imaging the coherent propagation of collective modes in the excitonic insulator Ta ₂ NiSe ₅ at room temperature