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Other titre : Skyrmions in monolayer and bilayer graphene

dc.contributor.advisorCôté, Renéfr
dc.contributor.authorLuo, Wenchenfr
dc.date.accessioned2014-05-16T15:36:27Z
dc.date.available2014-05-16T15:36:27Z
dc.date.created2009fr
dc.date.issued2009fr
dc.identifier.isbn9780494531808fr
dc.identifier.urihttp://savoirs.usherbrooke.ca/handle/11143/4826
dc.description.abstractGraphene, a monolayer of graphite, has been isolated in 2004 by Novoselov et al. [1]. Since then, it has been the subject of intense study both theoretically and experimentally. In this thesis, we study the ground states of the two-dimensional electron gas (2DEG) in graphene and bilayer graphene in a quantizing magnetic field. We first study the liquid phases at filling factors [nu] = 1, 2, 3, 4 including spins and valley pseudo-spins as well as the meron crystal phases with spin and valley pseudospin textures around filling factor [nu] = 1. We then look for single-particle excitations in a bilayer graphene system at the filling factor [nu] = -3. We find that charged pseudo-spin textures do not exist in such a system. The lowest charged excitations are the quasi-hole and quasi-electron states. We conclude that topological excitations do not play a significant role in the conductivity of the bilayer at [nu] = -3.fr
dc.language.isoengfr
dc.publisherUniversité de Sherbrookefr
dc.rights© Wenchen Luofr
dc.titleSkyrmions dans la simple couche et la bicouche de graphènefr
dc.title.alternativeSkyrmions in monolayer and bilayer graphenefr
dc.typeMémoirefr
tme.degree.disciplinePhysiquefr
tme.degree.grantorFaculté des sciencesfr
tme.degree.levelMaîtrisefr
tme.degree.nameM. Sc.fr


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