High-temperature quantum oscillations in graphene superlattices
Leonid Ponomarenko a, Roshan Krishna Kumar a b, Xi Chen b, Gregory Auton b, Artem Mishchenko b, Denis Bandurin b, Sergey Morozov c, Yang Cao b, Katya Khestanova b, Moshe Ben Shalom b, Vladimir Falko d, Andre Geim b
a Lancaster University, UK
b Manchester University, UK, Manchester, United Kingdom
c Institute of Microelectronics Technology, Chernogolovka, Russia
d National Graphene Institute, Manchester, UK, Manchester, United Kingdom
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SE3: 2D Nanomaterials Synthesis and Applications
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Hermenegildo García and Ana Primo
Invited Speaker, Leonid Ponomarenko, presentation 046
Publication date: 20th June 2016

Cyclotron motion of charge carriers in metals and semiconductors leads to Landau quantization and magneto-oscillatory behavior in their properties, such as Shubnikov-de Haas oscilations and quantum Hall effect. Cryogenic temperatures are usually required to observe phenomena. We show that superlattices formed in graphene on hexagonal boron nitride substrate support a different type of quantum oscillations that do not rely on Landau quantization. The period of oscilations is directly related to the lattice parameter of the superlattice. The oscillations are extremely robust and persist well above room temperature in magnetic fields of only a few T. We attribute this phenomenon to repetitive changes in the electronic structure of superlattices such that charge carriers experience effectively no magnetic field at simple fractions of the flux quantum per superlattice unit cell. Our work points at unexplored physics in Hofstadter butterfly systems at high temperatures.

  

© FUNDACIO DE LA COMUNITAT VALENCIANA SCITO
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info