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Nonlinear Photoelasticity to Explicate Acoustic Dephasing Dynamics

Lee, S. and Jeong, H. and Lee, H. and Minnich, A. J. and Jeon, S.-R. and Chung, T. H. and Stanton, C. J. and Jho, Y. D. (2018) Nonlinear Photoelasticity to Explicate Acoustic Dephasing Dynamics. . (Unpublished)

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Detection and controlling of acoustic (AC) phonon phase have been strenuous tasks although such capability is crucial for further manipulating thermal properties. Here, we present a versatile formalism for tracing AC nanowaves with arbitrary strain compositions by incorporating the nonlinear photoelasticity (PE) into ultrafast acoustics where broad AC spectrum encompassing thermally important THz frequency range should be collected far beyond Brillouin frequency. The initial AC phase upon displacive carrier generation could be inherently varied depending on the bipolar AC compositions by implementing externally biased piezoelectric diodes. The importance of adopting nonlinear PE is then manifested from the transient phase shift either abrupt at the point of diffuse surface scattering or gradual during phonon-phonon or phonon-electron scattering events based on which the ratio of nonlinear to linear PE coefficient is experimentally extracted as a function of the detection probe energy, reaching 0.98 slightly below the bandgap. As the probing energy is rather set away from the bandgap, AC phase is completely invariant with any scattering events, exhibiting the conventional trend at Brillouin frequency in linear regime. Under potent influence of nonlinear PE, the AC dephasing time during the propagation are quantified as a function of AC wavepacket size and further correlated with intrinsic and extrinsic AC scattering mechanisms in electron reservoir.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Minnich, A. J.0000-0002-9671-9540
Alternate Title:Nonlinear Photoelasticity to Explicate Acoustic Phonon Phase under Anharmonic and Extrinsic Decay
Additional Information:We thank Oliver B. Wright and Vitalyi Gusev for their insightful comments and suggestions. This work was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT & Future Planning (2018R1A2B6008101).
Funding AgencyGrant Number
National Research Foundation of Korea2018R1A2B6008101
Ministry of Science, ICT and Future Planning (Korea)UNSPECIFIED
Record Number:CaltechAUTHORS:20201028-103558286
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106328
Deposited By: Tony Diaz
Deposited On:29 Oct 2020 18:24
Last Modified:29 Oct 2020 18:24

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