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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Anharmonic phonons in few-layer MoS2: Raman spectroscopy of ultralow energy compression and shear modes

Résumé

Molybdenum disulfide (MoS2) is a promising material for making two-dimensional crystals and flexible electronic and optoelectronic devices at the nanoscale. MoS2 flakes can show high mobilities and have even been integrated in nanocircuits. A fundamental requirement for such use is efficient thermal transport. Electronic transport generates heat which needs to be evacuated, more crucially so in nanostructures. Anharmonic phonon-phonon scattering is the dominant intrinsic limitation to thermal transport in insulators. Here, using appropriate samples, ultralow energy Raman spectroscopy and first-principles calculations, we provide a full experimental and theoretical description of compression and shear modes of few-layer (FL) MoS2. We demonstrate that the compression modes are strongly anharmonic with a marked enhancement of phonon-phonon scattering as the number of layers is reduced, most likely a general feature of nanolayered materials with weak interlayer coupling.

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Dates et versions

hal-01053511 , version 1 (31-07-2014)

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Mohamed Boukhicha, Matteo Calandra, Marie-Aude Measson, Ophelie Lancry, Abhay Shukla. Anharmonic phonons in few-layer MoS2: Raman spectroscopy of ultralow energy compression and shear modes. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (19), pp.195316. ⟨10.1103/PhysRevB.87.195316⟩. ⟨hal-01053511⟩
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