Currents and pseudomagnetic fields in strained graphene rings
| Autor: | Nancy Sandler, Andrea Latge, Daiara Faria, Sergio E. Ulloa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Condensed matter physics Field (physics) Condensed Matter - Mesoscale and Nanoscale Physics Graphene Dirac (software) Rotational symmetry FOS: Physical sciences Persistent current Condensed Matter Physics Ring (chemistry) Magnetic flux Electronic Optical and Magnetic Materials law.invention Magnetic field law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) |
| Popis: | We study the effects of strain on the electronic properties and persistent current characteristics of a graphene ring using the Dirac representation. For a slightly deformed graphene ring flake, one obtains sizable pseudomagnetic (gauge) fields that may effectively reduce or enhance locally the applied magnetic flux through the ring. Flux-induced persistent currents in a flat ring have full rotational symmetry throughout the structure; in contrast, we show that currents in the presence of a circularly symmetric deformation are strongly inhomogeneous, due to the underlying symmetries of graphene. This result illustrates the inherent competition between the ``real'' magnetic field and the ``pseudo'' field arising from strains, and suggests an alternative way to probe the strength and symmetries of pseudomagnetic fields on graphene systems. |
| Databáze: | OpenAIRE |
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