The Hofstadter butterfly in graphene
Mardi 2 décembre 2014 13:30
- Duree : 1 heure
Lieu : LNCMI, salle de conférences "René Pauthenet" (bâtiment J, 2ème étage) - 25 rue des martyrs - 38000 Grenoble
Orateur : Benjamin PIOT (LNCMI)
In this talk, I will describe the recent experimental observation of the “Hofstadter butterfly”, a fractal energy spectrum of Bloch electrons in a magnetic field, in graphene / Boron Nitride (BN) superlattices. I will first introduce the “Hofstadter regime”, where electrons are submitted to a periodic potential and a magnetic field of comparable characteristic lengthscales, and present the concept of its realization in crystallographically aligned graphene-on-BN [1]. I will then discuss the transport experiments we used to probe the “butterfly”, as well as more recent capacitance measurements [2] giving a direct access to the electronic density of states up to magnetic fields of 30T.
[1] L.A. Ponomarenko et al, Nature 497, 594–597 (2013)
[2] G.L. Yu et al, Nature Physics 10, 525–529 (2014)
Contact : anne-laure.barra@lncmi.cnrs.fr
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