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arxiv: 2107.11959 · v2 · pith:3MUSGOE3new · submitted 2021-07-26 · ⚛️ physics.optics · cond-mat.mes-hall

Phonon-Enhanced Nonlinearities in Hexagonal Boron Nitride

Jared S. Ginsberg , M. Mehdi Jadidi , Jin Zhang , Cecilia Y. Chen , Nicolas Tancogne-Dejean , Sang Hoon Chae , Gauri N. Patwardhan , Lede Xian
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Kenji Watanabe Takashi Taniguchi James Hone Angel Rubio Alexander L. Gaeta
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classification ⚛️ physics.optics cond-mat.mes-hall
keywords boronenhancementshexagonallargenitridenonlinearitiesobserveoptical
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We investigate optical nonlinearities that are induced and enhanced due to the strong phonon resonance in hexagonal boron nitride. We predict and observe large sub-picosecond duration signals due to four-wave mixing (FWM) during resonant excitation. The resulting FWM signal allows for time-resolved observation of the crystal motion. In addition, we observe enhancements of third-harmonic generation with resonant pumping at the hBN transverse optical phonon. Phonon-induced nonlinear enhancements are also predicted to yield large increases in high-harmonic efficiencies.

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