Výsledky vyhledávání - "CLARK, J. N."

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Photo-induced plasmon-phonon coupling in PbTe

We report the observation of photo-induced plasmon-phonon coupled modes in the group IV-VI semiconductor PbTe using Fourier-transform inelastic X-ray scattering at the Linac Coherent Light Source (LCLS). We measure the near-zone-center dispersion of

Externí odkaz: http://arxiv.org/abs/2109.01301

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Formation of buried domain walls in the ultrafast transition of SmTe$_3$

Autor: Trigo, M., Giraldo-Gallo, P., Clark, J. N., Kozina, M. E., Henighan, T., Jiang, M. P., Chollet, M., Fisher, I. R., Glownia, J. M., Katayama, T., Kirchmann, P. S., Leuenberger, D., Liu, H., Reis, D. A., Shen, Z. X., Zhu, D.

Publikováno v: Phys. Rev. B 103, 054109 (2021)

We study ultrafast x-ray diffraction on the charge density wave (CDW) of SmTe$_3$ using an x-ray free electron laser. The CDW peaks show that photoexcitation with near-infrared pump centered at 800 nm generates domain walls of the order parameter pro

Externí odkaz: http://arxiv.org/abs/2006.08879

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Coherent order parameter dynamics in SmTe$_3$

Autor: Trigo, M., Giraldo-Gallo, P., Kozina, M. E., Henighan, T., Jiang, M. P., Liu, H., Clark, J. N., Chollet, M., Glownia, J. M., Zhu, D., Katayama, T., Leuenberger, D., Kirchmann, P. S., Fisher, I. R., Shen, Z. X., Reis, D. A.

Publikováno v: Phys. Rev. B 99, 104111 (2019)

We present a combined ultrafast optical pump-probe and ultrafast x-ray diffraction measurement of the CDW dynamics in SmTe$_3$ at 300 K. The ultrafast x-ray diffraction measurements, taken at the Linac Coherent Light Source reveal a $\sim 1.55$ THz m

Externí odkaz: http://arxiv.org/abs/1809.09799

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Multiple supersonic phase fronts launched at a complex-oxide hetero-interface

Autor: Först, M., Beyerlein, K. R., Mankowsky, R., Hu, W., Mattoni, G., Catalano, S., Gibert, M., Yefanov, O., Clark, J. N., Frano, A., Glownia, J. M., Chollet, M., Lemke, H., Moser, B., Collins, S. P., Dhesi, S. S., Caviglia, A. D., Triscone, J. -M., Cavalleri, A.

Publikováno v: Physical Review Letters 118, 027401 (2017)

Selective optical excitation of a substrate lattice can drive phase changes across hetero-interfaces. This phenomenon is a non-equilibrium analogue of static strain control in heterostructures and may lead to new applications in optically controlled

Externí odkaz: http://arxiv.org/abs/1612.04089

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How to distinguish squeezed and coherent phonons in femtosecond x-ray diffuse scattering

Autor: Henighan, T., Trigo, M., Chollet, M., Clark, J. N., Fahy, S., Glownia, J. M., Jiang, M. P., Kozina, M., Liu, H., Song, S., Zhu, D., Reis, D. A.

Publikováno v: Phys. Rev. B 94, 020302 (2016)

Impulsive optical excitation can generate both coherent and squeezed phonons. The expectation value of the phonon displacement $$ oscillates at the mode frequency for the coherent state but remains zero for a pure squeezed state. In contrast, bo

Externí odkaz: http://arxiv.org/abs/1510.02403

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