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Graphene Technology: Magnetic and Electronic Properties

Speaker: 
Dr Choonkyu Hwang (Lawrence Berkeley National Laboratory, Berkeley, USA)
Date: 
Thu, 17/05/2012 - 12:00pm to 1:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Event Type: 
Seminars

Abstract:

Graphene is a wonderful material in many aspects. This thinnest and strongest material possesses a simple geometric structure, but exhibits beautiful physical properties based on its massless Dirac Fermionic behavior. Its charge carrier can travel with huge mobility approaching ballistic transport regime. Graphene under certain conditions is expected to show spin polarized electric current holding significant promise for future spintronic devices. In this talk, I will discuss the potential of graphene technology in terms of two different fundamental aspects, magnetic and electronic properties, mainly based on Angle-resolved photoemission spectroscopy (ARPES) studies. First, despite a lot of theoretical studies on magnetic graphene, long range order of local magnets and detailed experimental studies on the magnetism are still in a veil. I will show our recent studies on the first direct evidence of complex spin texture in a carbon-based system, which will be of great interests not only in realizing ferromagnetic quantum Hall effect and other strongly correlated electronic states, but also giving intriguing insight on the realization of graphene based spintronic devices. Second, charge carriers in graphene are expected to show clear deviation from normal Fermi liquids. Hence, Fermi velocity, an important ingredient of electronic properties, can be controlled by changing electronic correlations. I will show that electronic correlations and resultant Fermi velocity can be controlled simply via a substrate hosting graphene on it, which provides not only a completely new route to control electronic properties, but also a straightforward evidence of non-Fermionic behavior of charge carriers in graphene.

 

About the speaker:

Ph.D. in Physics, 2008 at Pohang University of Science and Technology. Post-doctoral fellow at Lawrence Berkeley National Laboratory. Research interests are strongly correlated physics in graphene and new experimental techniques based on ARPES, such as time-resolved, gated, and spin-resolved ARPES.

 

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