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Author:Laitinen, Antti
Title:Electrical Transport Experiments on Suspended Graphene
Sähköisiä johtavuusmittauksia vapaasti riippuvassa grafeenissa
Publication type:Master's thesis
Publication year:2014
Pages:[7] + 49      Language:   eng
Department/School:Perustieteiden korkeakoulu
Main subject:Fysiikka   (Tfy-3)
Supervisor:Hakonen, Pertti
Instructor:
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201507013665
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

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Opening a thesis

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    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

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Printing the thesis

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  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  1043   | Archive
Keywords:graphene
transport
low temperature
interference
grafeeni
matala lämpötila
Fabry-Pérot
interferenssi
fleksuraalifononi
sironta
Abstract (eng): Graphene, a hexagonal grid of carbon atoms arranged into an atomically thin 2D-lattice, is one of the strongest known materials with extraordinary electrical properties.

These properties were investigated by probing a micron-sized graphene flake suspended between current leads using standard conductance measurements while the charge carrier density was tuned with a back gate.

The gate dependence of conductance of the high-quality monolayer graphene sample was in line with the theory of ballistic graphene reaching mobilities up to 105 cm2/(Vs).

Measurements as a function of temperature showed evidence of scattering from flexural phonons.

At low temperatures, electronic multimode Fabry-Pérot interference was observed.
Abstract (fin): Grafeeni, heksagonaaliseen atomikerroksen paksuiseen hilaan järjestäytynyt hiilen allotrooppi, on yksi vahvimmista tunnettuista materiaaleista.
Lisäksi sillä on erinomaiset sähköiset ominaisuuksuudet.

Ominaisuuksia tutkittiin mikro-kokoluokan vapaasti riippuvissa grafeeninäytteissä matalataajuisilla konduktanssimittauksilla muuttamalla samalla varaustiheyttä hilaelektrodin avulla.

Mitatun korkealaatuisen yksikerroksisen grafeeninäytteen konduktanssin varaustiheyskäytös sopi ballistisen grafeenin teoriaan.
Mittauksissa saavutettu suurin mobiliteetti oli 105 cm2/(Vs).

Lämpötilan funktiona tehdyissä mittauksissa havaittiin merkkejä fleksuraalifononien kontribuutiosta kokonaisresistanssiin.
Matalissa lämpötiloissa havaittiin elektronien Fabry-Pérot interfernssi.
ED:2014-04-04
INSSI record number: 48820
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