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Probing transport and magnetic properties of graphene with adatoms through optical conductivity

Speaker: 
Andrivo Rusydi (NUS, Department of Physics)
Date: 
Wed, 25/06/2014 - 11:00am to 12:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Event Type: 
Seminars

Abstract

Graphene and two-dimensional systems in general are believed to be a promising candidate for future electronic devices, because of its extremely high electronic mobility compared to semiconductors used in most electronics today. Despite this outstanding characteristics, a pure graphene material is gapless, thus cannot yet be used to function as a transistor or a diode. One way to generate a gap, and possibly add magnetic properties to graphene is through adsorption of certain atoms (adatoms). Along this way, however, one may need to characterize both transport and magnetic properties in separate challenging experiments using different instruments. Here, we present our theoretical study that suggests a way to interpret simultaneously both transport and magnetic properties of graphene with adatoms solely through optical conductivity measurement. The key idea is that there is an intimate connection between the low- and the high-energy behavior of the optical conductivity, from which we can deduce whether the system is gapped or gapless, whether or not the adatoms are magnetic, and what sort of magnetic ordering the adatoms may form.

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