Dynamically-enhanced strain in atomically thin resonators

Xin Zhang (), Kevin Makles, Léo Colombier, Dominik Metten, Hicham Majjad, Pierre Verlot and Stéphane Berciaud ()
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Xin Zhang: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg
Kevin Makles: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg
Léo Colombier: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg
Dominik Metten: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg
Hicham Majjad: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg
Pierre Verlot: University of Nottingham
Stéphane Berciaud: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Graphene and related two-dimensional (2D) materials associate remarkable mechanical, electronic, optical and phononic properties. As such, 2D materials are promising for hybrid systems that couple their elementary excitations (excitons, phonons) to their macroscopic mechanical modes. These built-in systems may yield enhanced strain-mediated coupling compared to bulkier architectures, e.g., comprising a single quantum emitter coupled to a nano-mechanical resonator. Here, using micro-Raman spectroscopy on pristine monolayer graphene drums, we demonstrate that the macroscopic flexural vibrations of graphene induce dynamical optical phonon softening. This softening is an unambiguous fingerprint of dynamically-induced tensile strain that reaches values up to ≈4 × 10−4 under strong non-linear driving. Such non-linearly enhanced strain exceeds the values predicted for harmonic vibrations with the same root mean square (RMS) amplitude by more than one order of magnitude. Our work holds promise for dynamical strain engineering and dynamical strain-mediated control of light-matter interactions in 2D materials and related heterostructures.

Date: 2020
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DOI: 10.1038/s41467-020-19261-3

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