Tour 2: A tight-binding model on a square lattice
-------------------------------------------------

Let us now consider free fermions on a Bravais lattice. 
We will set up a square lattice with the nearest
neighbour hopping using the ``BravaisLattice`` class of TRIQS, compute its
density of states (DOS) and then plot it by using again the ``oplot`` function.


.. literalinclude:: ../lattice/ex1.py
   :lines: 1-34

.. image:: ../lattice/ex1.png
   :width: 700
   :align: center

More information on the lattice tools implemeted in TRIQS can be :ref:`found here <lattice>`