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TitleInvestigation of local breakdown of the Quantum Hall effect in graphene probed with invasive metal contacts
NameDuerr, Fabian (author), Andrei, Eva (chair), Wu, Weida (internal member), Yuzbashyan, Emil (internal member), Rutgers University, Graduate School - New Brunswick,
Degree Date2009-10
Date Created2009
SubjectPhysics and Astronomy,
Quantum Hall effect,
Graphene
DescriptionWe investigate the local breakdown of the Quantum Hall Effect (QHE) effect in a graphene device caused by the constraints of the Hall bar geometry and finite size of the sample. First to account for principal features of the data we use a multi-carrier model that simulates the transverse and longitudinal resistance of doped samples in low magnetic fields. This model however can not reproduce the reduction of Hall voltage measured in the vicinity of the current leads. Therefore we introduce a second model which describes the effect of distribution of electric field in the device, giving a reasonable scenario that can explain our experimental data and deviations from the case of perfect geometry. We conclude that the existence of Hot Spots in two corners of the sample leads to the local break down of the QHE around this points.
NoteM.S.
NoteIncludes bibliographical references (p. 65-68)
Noteby Fabian Duerr
Genretheses
Persistent URLhttp://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051810
Languageeng
CollectionGraduate School - New Brunswick Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work