Two-dimensional gas of massless Dirac fermions in graphene
This study reports an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation and reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions.
The structure of suspended graphene sheets
- Jannik C. Meyer, A. Geim, M. Katsnelson, K. Novoselov, T. Booth, S. Roth
- 16 January 2007
These studies by transmission electron microscopy reveal that individual graphene sheets freely suspended on a microfabricated scaffold in vacuum or air are not perfectly flat: they exhibit intrinsic microscopic roughening such that the surface normal varies by several degrees and out-of-plane deformations reach 1 nm.
Microfabricated adhesive mimicking gecko foot-hair
- A. Geim, S. Dubonos, I. Grigorieva, K. Novoselov, A. Zhukov, S. Shapoval
- PhysicsNature Materials
- 1 July 2003
A prototype of such 'gecko tape' is reported on, made by microfabrication of dense arrays of flexible plastic pillars, the geometry of which is optimized to ensure their collective adhesion.
Unconventional quantum Hall effect and Berry’s phase of 2π in bilayer graphene
There are two known distinct types of the integer quantum Hall effect. One is the conventional quantum Hall effect, characteristic of two-dimensional semiconductor systems1,2, and the other is its…
Of flying frogs and levitrons
Diamagnetic objects are repelled by magnetic fields. If the fields are strong enough, this repulsion can balance gravity, and objects levitated in this way can be held in stable equilibrium,…
Cloning of Dirac fermions in graphene superlattices
Graphene superlattices such as this one provide a way of studying the rich physics expected in incommensurable quantum systems and illustrate the possibility of controllably modifying the electronic spectra of two-dimensional atomic crystals by varying their crystallographic alignment within van der Waals heterostuctures.
Plasmon spectroscopy of free-standing graphene films
Plasmon spectroscopy of the thinnest possible membrane, a single layer of carbon atoms: graphene, has been carried out in conjunction with ab initio calculations of the low loss function. We observe…
Light-emitting diodes by band-structure engineering in van der Waals heterostructures.
It is shown that light-emitting diodes made by stacking metallic graphene, insulating hexagonal boron nitride and various semiconducting monolayers into complex but carefully designed sequences can also provide the basis for flexible and semi-transparent electronics.
Graphene: Exploring carbon flatland
Just one atom thick, this two-dimensional semiconductor does not resemble any known material.