First principle techniques toward understanding of lattice thermal transport

Date: 24 October 2019

Venue: UAntwerp, Campus Groenenborger, G.U.241 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Organization / co-organization: CMT

Short description: Condensed Matter Lecture presented by Dr Tribhuwan Pandey from CMT

Phonon-phonon interactions originating from lattice anharmonicity often are the most dominant resistance for thermal energy transfer in semiconductors and insulators. These interactions are governed by energy and crystal momentum conservation conditions, which dictate the amount of scattering available to phonons, and therefore, decide mode lifetimes and thermal conductivity. This talk will discuss the basic methodology behind such calculations. In particular (i) effect mass variation on thermal conductivity in La3Cu3X4 (X= P, As, Sb, and Bi) compounds (ii) and the effect of hydro-static pressure on thermal conductivity of bulk MoS2 will be discussed. In the second part of the talk we will discuss chiral phonons in one dimensional structure. We will show that these chiral phonons obey new symmetry-based scattering rules that limit thermal resistance.

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