Anomalous Hall effect and persistent valley currents in graphene p-n junctions/
Name
898329165-MIT.pdf
Description
Full printable version
Size
2.34 MB
Format
Adobe PDF
Checksum (MD5)
5a635f534b151da2ab661560547ee352
Author(s)
Samutpraphoot, Polnop
Advisor(s)
Leonid S. Levitov.
Date Issued
2014
Publisher
Massachusetts Institute of Technology
Abstract
Dirac particles can exhibit Hall-like transport induced by Berry's gauge field in the absence of magnetic field. We develop a detailed picture of this unusual effect for charge carriers in graphene nanostructures. The Hall effect is nonzero in each valley but is of opposite signs in different valleys, giving rise to charge-neutral valley currents. Our analysis reveals that p-n junctions in graphene support persistent valley currents that remain nonzero in the system ground state (in thermodynamic equilibrium). The valley currents can be controlled via the bias and gate voltages, enabling a variety of potentially useful valley transport phenomena.
Description
Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 39-40).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
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