update corbino example

content/index.txt

@@ -23,12 +23,14 @@ Kwant was used). Below is a rapid survey of a few applications of Kwant.
 conductance of a Corbino disk in a quantum Hall regime
 ------------------------------------------------------
 
-Bla Bla
+.. container:: leftside
 
-.. image:: collage.png
-   :scale: 30%
-   :target: collage.png
+   .. image:: corbino.png
 
+Transport properties of a Corbino disk across a quantum Hall transition. Left
+panel: winding number of the reflection matrix, which has to change from 0 to 1
+across the transition. Right panel: conductance across the transition, showing
+quantized conductance peaks.
 
 
 A piece of bilayer graphene lattice
@@ -51,4 +53,4 @@ GaAs/GaAlAs heterostrucutre. See Yamamoto et al, Nature Nanotechnology 7, 247 (2
 (Simulations: T. Bautze et al. to be submitted to Phys. Rev. B). In this example, particular attention was paid to designing a realistic
 model for the confining potential seen by the electrons so that rather subtle aspects of the experiments could be reproduce. Such type of
 "numerical experiments" can not only be used to interpret the experimental data but also as an aid in designing the sample geometry or in the choice of
-materials. 
\ No newline at end of file
+materials.