Coherent phonon relaxation in strontium titanate

Jeremy Sylvester; Rashmi Choudhary; Bharat Jalan; Feruz Ganikhanov

doi:10.1063/5.0153409

Coherent phonon relaxation in strontium titanate

Jeremy Sylvester, Rashmi Choudhary, Bharat Jalan, Feruz Ganikhanov

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

Abstract

Ultrafast decays of the intrinsic phonon modes within 260-790 cm⁻¹ range of frequencies, which are symmetry forbidden in the first-order Raman scattering in bulk SrTiO₃ crystal, have been traced using time-resolved coherent Raman technique. The effective phonon decay times are within 0.86-1.38 ps and yield corresponding linewidths of 7.7-12.3 cm⁻¹ for optical lattice vibrations. Symmetry breakage mechanisms related to free charged carriers resulting from vacancies do not appear to play a major role.

Original language	English (US)
Article number	022201
Journal	Applied Physics Letters
Volume	123
Issue number	2
DOIs	https://doi.org/10.1063/5.0153409
State	Published - Jul 10 2023

Bibliographical note

Funding Information:
R.C. and B.J. acknowledge the support from the Air Force Office of Scientific Research (AFOSR) through Grant Nos. FA9550-21-1-0025 and FA9550-21-0460. J.S. and F.G. acknowledge the support from the AFOSR through Grant No. FA9550-18-1-0273. Help from C. Neupane, H. Singhapura, and D. Senarathna (Department of Physics, URI) is greatly appreciated.

Funding Information:
R.C. and B.J. acknowledge the support from the Air Force Office of Scientific Research (AFOSR) through Grant Nos. FA9550-21-1-0025 and FA9550-21-0460. J.S. and F.G. acknowledge the support from the AFOSR through Grant No. FA9550-18-1-0273. Help from C. Neupane, H. Singhapura, and D. Senarathna (Department of Physics, URI) is greatly appreciated.

Publisher Copyright:
© 2023 Author(s).

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10.1063/5.0153409

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abstract = "Ultrafast decays of the intrinsic phonon modes within 260-790 cm−1 range of frequencies, which are symmetry forbidden in the first-order Raman scattering in bulk SrTiO3 crystal, have been traced using time-resolved coherent Raman technique. The effective phonon decay times are within 0.86-1.38 ps and yield corresponding linewidths of 7.7-12.3 cm−1 for optical lattice vibrations. Symmetry breakage mechanisms related to free charged carriers resulting from vacancies do not appear to play a major role.",

author = "Jeremy Sylvester and Rashmi Choudhary and Bharat Jalan and Feruz Ganikhanov",

note = "Funding Information: R.C. and B.J. acknowledge the support from the Air Force Office of Scientific Research (AFOSR) through Grant Nos. FA9550-21-1-0025 and FA9550-21-0460. J.S. and F.G. acknowledge the support from the AFOSR through Grant No. FA9550-18-1-0273. Help from C. Neupane, H. Singhapura, and D. Senarathna (Department of Physics, URI) is greatly appreciated. Funding Information: R.C. and B.J. acknowledge the support from the Air Force Office of Scientific Research (AFOSR) through Grant Nos. FA9550-21-1-0025 and FA9550-21-0460. J.S. and F.G. acknowledge the support from the AFOSR through Grant No. FA9550-18-1-0273. Help from C. Neupane, H. Singhapura, and D. Senarathna (Department of Physics, URI) is greatly appreciated. Publisher Copyright: {\textcopyright} 2023 Author(s).",

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AB - Ultrafast decays of the intrinsic phonon modes within 260-790 cm−1 range of frequencies, which are symmetry forbidden in the first-order Raman scattering in bulk SrTiO3 crystal, have been traced using time-resolved coherent Raman technique. The effective phonon decay times are within 0.86-1.38 ps and yield corresponding linewidths of 7.7-12.3 cm−1 for optical lattice vibrations. Symmetry breakage mechanisms related to free charged carriers resulting from vacancies do not appear to play a major role.

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Coherent phonon relaxation in strontium titanate

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