Optomechanical measurement of thermal transport in two-dimensional MoSe2 lattices

Abstract

Nanomechanical resonators have emerged as sensors with exceptional sensitivities. These sensing capabilities open new possibilities in the studies of the thermodynamic properties in condensed matter. Here, we use mechanical sensing as a novel approach to measure the thermal properties of low-dimensional materials. We measure the temperature dependence of both the thermal conductivity and the specific heat capacity of a transition metal dichalcogenide (TMD) monolayer down to cryogenic temperature, something that has not been achieved thus far with a single nanoscale object. These measurements show how heat is transported by phonons in two-dimensional systems. Both the thermal conductivity and the specific heat capacity measurements are consistent with predictions based on first-principles.

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• Dynamics of 2D Material Membranes
• Ultrasensitive nano-optomechanical force sensor at dilution temperatures
• Dimensional crossover of acoustic phonon lifetime in $2H$-MoSe${}_2$
• Tunable spin polarization and electronic structure of bottom-up synthesized MoSi${}_2$N${}_4$ materials
• Dynamically-enhanced strain in atomically thin resonators
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• Ultra-low dissipation patterned silicon nanowire arrays for scanning probe microscopy
• Interlayer exciton-polaron in atomically thin semiconductors
• Nonequilibrium Thermodynamics of Acoustic Phonons in Suspended Graphene
• Superconducting vortex-charge measurement using cavity electromechanics
• Flexural deformations and collapse of bilayer two-dimensional crystals by interlayer exciton
• Enhanced Magnetization by Defect-Assisted Exciton Recombination in Atomically Thin CrCl${}_3$
• Radiation pressure backaction on a hexagonal boron nitride nanomechanical resonator
• Temperature mediated back-action in micro- and nanomechanical resonators
• Photothermal responsivity of van der Waals material-based nanomechanical resonators
• Nanomechanical vibrational response from electrical mixing measurements
• Nanomechanical probing and strain tuning of the Curie temperature in suspended Cr${}_2$Ge${}_2$Te${}_6$ heterostructures