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Condensed Matter Physics Group

To illustrate our results

Some selective images that we like

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Tuning the valley and chiral quantum state of Dirac electrons in van der Waals heterostructures

 

Moire pattern for graphene on hexagonal boron nitride.

Controlling magnetic clouds in graphene.

graphene BN Moire pattern

Artistic impression of Hofstadter butterfly effect in graphene/BN heterostructures exposed to mangetic field. In such heterostructures Moire pattern arises due to mismatch and rotation between atomic lattices of graphene and hexagonal boron nitride. PDF file.
Please, acknowledge Columbia University in case you are planning to use this image.

graphene BN Moire pattern graphene BN Moire pattern

Artistic impression of Hofstadter butterfly effect in graphene/BN heterostructures exposed to mangetic field. In such heterostructures Moire pattern arises due to mismatch and rotation between atomic lattices of graphene and hexagonal boron nitride. TIFF files.
Please, acknowledge Columbia University in case you are planning to use these images.

graphene BN Moire pattern graphene BN Moire pattern graphene BN Moire pattern

Artistic impressions of Hofstadter butterfly effect in graphene/BN heterostructures exposed to mangetic field. In such heterostructures Moire pattern arises due to mismatch and rotation between atomic lattices of graphene and hexagonal boron nitride. JPG files.
Please, acknowledge Columbia University in case you are planning to use these images.

graphene BN Moire pattern Graphene BN Moire file name: GrapheneBNMoireRed200x200.gif

Moire pattern due to mismatch and rotation between atomic lattices of graphene and hexagonal boron nitride

Heterostructures based on 2D atomic crystals for bendable photovoltaic applications

Heterostructures based on 2D atomic crystals for photovoltaic applications

Landau fan-diagram for a high-quality graphene capacitor

Tunnelling transistor based on vertical graphene heterostructures. Tunnelling current between two graphene layers can be controlled by gating

Graphene/Boron Nitride heterostructure - Dr Kostya Novoselov

Dr. Rahul R. Nair (who carried out this work) shows his research sample: one micron thick graphene oxide film.

Artistic view:Water easily evaporates through graphene oxide membranes but they represent an impermeable barrier for other molecules - Dr Rahul R.Nair

blg still small blg moving

Interaction-driven spectrum reconstruction in bilayer graphene.

Cones1small Cones2small Cones3Small Cones Thinker 1small

Artistic impressions of the Dirac cones reshaped by e-e interaction by Prof. Kostya Novoselov and Dr Daniel Elias.

Zeeman-induced spin Hall effect in Graphene

Zeeman-induced spin Hall effect in graphene by Dr Daniel Elias.

strained graphene strained graphene strained graphene strained graphene
Strain in graphene opens up a pseudomagnetic gap.

graphane graphane graphane graphane graphane
Graphane crystal. This novel two-dimensional material is obtained from graphene (a monolayer of carbon atoms) by attaching hydrogen atoms (red) to each carbon atoms (blue) in the crystal.

LCD cell with graphene electrods LCD cell with graphene electrods
Liquid Crystal Device with electrodes made of graphene with different voltages applied. The overall width of the image is 30 microns.

Dr Ponomarenko with graphene transistor
Dr Ponomarenko (who carried out this work) shows his research sample: graphene quantum dots on a chip.

graphene quantum dot
SEM image of a graphene quantum dot device. The scale bar is 20 nm.

graphene constriction
SEM image of a nanoconstriction in graphene. The scale bar is 20 nm.

molecular transistor from graphene molecular transistor from graphene
Artistic view of our smallest (nanometre size) quantum dot.

 

Rahul with his graphene membrane
PhD student Rahul Nair (who carried out this work) shows his research sample: a scaffold in which several apertures are covered by graphene.

copper scaffolding with graphene membrane copper scaffolding with graphene membrane
Magnified image of research samples with small holes covered by one-atom-thick graphene. One can see light passing through them by the naked eye.

optical transparency of graphene
The fine structure constant makes graphene visible. Looking through an aperture partially covered by graphene (central stripe) and two layers of graphene (region to the right), one can directly compare their opacities. The central region absorbs 2.3 percent of incident light and the bilayer region twice more.

NO2 molecule on graphene
NO2 molecule on graphene surface

graphene quantum dot
Quantum dot carved from a graphene sheet.

graphene membranes
Bright-field TEM image of a suspended graphene membrane. Its central part (bluish) is monolayer graphene. Electron diffraction images from different areas of the flake show that it is a single crystal without domains. We note scrolled top and bottom edges and a strongly folded region on the right. The typical distance between the golden bars is 500 nm. Credit to Jannik Meyer

artistic representation of graphene
Artistic impression of a corrugated graphene sheet. JPG file (160 Kb). Credit to Jannik Meyer

artistic representation of graphene
Artistic impression of a corrugated graphene sheet. PDF file (4 Mb). Credit to Jannik Meyer

artistic representation of graphene
Artistic impression of a corrugated graphene sheet. No Background. JPG file (30 Mb). Credit to Jannik Meyer

artistic representation of graphene
Artistic impression of a corrugated graphene sheet. No Background. PNG file (30 Mb). Credit to Jannik Meyer

artistic representation of graphene
Artistic impression of a corrugated graphene sheet. No Background. JPG file (28 Mb). Credit to Jannik Meyer

graphene flake
AFM image of a graphene molecule. The window size is 10x10 micron (the graphene film is only one atom thick but approx. 100,000 atoms long in the two lateral directions (i.e. contains many billions of carbon atoms).

graphene fabric
Graphene nanofabric. SEM micrograph of a strongly crumpled graphene sheet on a Si wafer. Note that it looks just like silk thrown over a surface. Lateral size of the image is 20 microns. Si wafer is at the bottom-right corner.

graphene
Artistic impression of graphene molecules. Samples of carbon "nanofabric" studied in the Science report are much much larger laterally: they consist of many billions of carbon atoms but still only a single atom thick.

Image "graphene molecule.jpg" is copyrights of Chris Ewels (www.ewels.info)

graphene transistor
Scanning electron micrograph (in false colour) of a transistor made on a part of single-layer graphene. Au contacts are shown in gold, SiO2/Si substrate is blue. The width of the graphene wire is 200 nm.

graphene flake
Graphene flakes of different thickness (1, 2, 3, 4 and more layers). Optical photo in normal white light. Lateral size of the image is 200 microns.

multilayer graphene sliced graphene
Scanning electron micrograph of a fallen mesa of graphite. This is the way graphene molecules were "extracted" from bulk graphite. To be reasonably visible in SEM, we show a 10 nm carbon flake (30 layer thick).

pleated graphene
AFM image (3x3 micron in size) of single-atom-thin carbon nanofabric. Notice that graphene looks just like a silk tissue thrown on a surface: it is creased with many folds, pleats and wrinkles.

lab
Researchers use electron-beam lithography to microfabricate graphene devices

lab
Dr Irina Grigorieva behind our SEM before looking at the prepared graphene devices.

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