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Subject: ELFT HÍRADÓ
[Fizinfo] E. V. Castro eloadasa grafenrol, majus 26.
- From: Balazs Dora <dora AT kapica.phy.bme.hu>
- To: fizinfo AT lists.kfki.hu
- Subject: [Fizinfo] E. V. Castro eloadasa grafenrol, majus 26.
- Date: Fri, 21 May 2010 13:55:47 +0200 (CEST)
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- List-id: ELFT HÍRADÓ <fizinfo.lists.kfki.hu>
2010. majus 26-an 10 orai kezdettel Eduardo V. Castro eloadast tart a BME Fizika Tanszeken (F. epulet, 2. emelet, 13-as labor) "Temperature dependent resistivity in doped suspended graphene: the role of phonons"
ABSTRACT: The scattering mechanism which ultimately limits mobility at room temperature in graphene is of utmost importance from the point of view of applications. From a more fundamental point of view unveiling
such mechanism should provide important clues to understand this fascinating system. Recently, suspended graphene samples were shown to have mobilities higher by at least 1 order of magnitude than the non-suspended ones. The reported big numbers, however, show up only at low temperatures; at room temperature mobility falls into the values reported for non-suspended samples. When the system is suspended acoustic phonons
should be the ultimate scatterers determining the temperature dependent resistivity, and hence mobility. In this talk I will explore the effect of flexural phonons -- out-of-plane vibrations of the graphene
membrane -- on the resistivity's temperature dependence of doped suspended graphene. It will be shown that flexural acoustic phonons give the major scattering contribution at room temperature, and indeed limit mobility to values known for samples on substrate. Under strain, however, scattering by flexural phonons becomes negligible, thus providing a solution to the room temperature flexural phonon limited mobility in doped suspended graphene. Moreover, by manipulating locally the induced strain it is
possible to control the current path in real space; an example of strain engineering applied to graphene.
Minden erdeklodot szeretettel varunk!
- [Fizinfo] E. V. Castro eloadasa grafenrol, majus 26., Balazs Dora, 05/21/2010
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