Kavli Affiliate: Herre S. J. Van Der Zant
| First 5 Authors: Hanqing Liu, Hanqing Liu, , ,
| Summary:
For the development of nanoscale electronics and photonics using atomically
thin two-dimensional (2D) materials, it is important to realize van der Waals
(vdW) interfaces with low thermal resistance, to minimize performance reduction
caused by heat accumulation. However, characterizing the thermal interface
resistance between vdW materials is still a challenge. Here, we introduce a
novel optomechanical methodology to characterize the thermal transport across
interfaces in 2D heterostructures. We first determine the specific heat and
thermal conductivity as the function of temperature for the upper and lower
material layers separately and then extract the thermal boundary conductance
(TBC) of the heterostructure from its thermal time constant. We obtain a TBC of
$2.41 pm 1.03$ and $4.14 pm 1.74$~siMW m^2 K^-1 for FePS$_3$/WSe$_2$
and MoS$_2$/FePS$_3$ interfaces, respectively, which are comparable to values
reported in the literature. Moreover, they agree with a Debye model including
the acoustic impedance mismatch of flexural phonons. This work enables
efficient thermal management down to the nanoscale and offers new insights into
energy dissipation in vdW heterostructures.
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