Phys : Seminars / 09.04.2015 - Hâldun Sevinçli : Quantum transport in nano-structured systems: From nanometer to micrometer scale

Quantum transport in nano-structured systems: From nanometer to micrometer scale

Hâldun Sevinçli
Department of Materials Science and Engineering, IZTECH
09 April 2015, Thursday, 14:40
Physics Department Cavid Erginsoy Seminar Room

Abstract: Continuous miniaturization of devices have been giving rise to pronounced quantum features in device physics, where the presence or absence of a single atomic layer makes enormous difference. In addition to that, the recent discovery of two-dimensional materials made it possible to tailor the bulk properties of the material just by functionalizing its surface, as bulk and surface mean the same thing at this limit. Having such a control, we have the opportunity to engineer quantum effects such that unprecedented device performances are possible. In this seminar, I will talk about quantum transport theory and computational modeling of quantum transport phenomena, mainly in graphene based systems. I will present our recent results regarding electronic and phononic transport at length scales ranging from nanometers to micrometers, and ballistic, diffusion and localization regimes where the systems are modeled with atomistic detail. The second focus of my talk will be thermoelectric transport. Thermoelectric efficiency requires a high electrical conductivity like in metals, a large Seebeck coefficient like in insulators and a poor thermal conductivity like in glasses. Having such diverse (if not contradictory) demands, increasing thermoelectric efficiency is a challenging task. I will summarize the main strategies for better thermoelectric efficiency and will show our proposals for optimizing it in nano-structured systems.

Reminder: Tea and cookies will be in the seminar room before the seminar.

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