Lattice Thermal Conductivity of Silicene
The lattice thermal conductivity, κp, of suspended silicene is studied, using theoretical model and numerical calculations, over a wide temperature range (2 < T < 400 K). Explicit contributions from the in-plane longitudinal acoustic (LA) and transverse acoustic (TA) phonons and out-of-plane flexural (ZA) phonons are taken into account. Scattering of phonons by system boundaries, impurities and other phonons via umklapp process are considered. Numerical results presented show that, at low temperatures, the ZA phonon contribution is dominant, whereas at higher temperatures the LA and TA phonon contributions become important. A step-like behavior of κ p at low temperatures is observed due to the dominance of the ZA phonons. The study highlights the relative importance of the three acoustic phonon modes in limiting κ p , which could have important implications for the thermoelectric effect in silicene.
KeywordsSilicene Thermal conductivity
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One of the authors (MDK) acknowledges the Pavate Foundation and Karnatak University, Dharwad for the award of Dr. D.C. Pavate Visiting Fellowship at Cambridge University, UK.
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