Computing: Difference between revisions

Revision as of 01:50, 12 March 2010

electron_density.m (code for Problem 1 in Homework Set 1)
disordered_nanowire.m (code for Problems 2 & 3 in Homework Set 2)
dos_negf.m (code to compute the density of states of a nanowire using Green functions)
graphene_dos.m (code to compute the density of states of graphene sheet using Green functions)
qt_1d.m (code to compute the conductance and total and local density of states of a 1D nanowire, with possible potential barriers or impurities, attached to two semi-infinite electrodes)

matrix_exp.m (Exponential, or any other function with small changed in the code, of a Hermitian matrix)
visual_graphene_H.m (For a given tight-binding Hamiltonian on the honeycomb lattice, function plots position of carbon atoms and draws blue lines to represent hoppings between them; red circles to represent on-site potential between them; and cyan lines to represent the periodic boundary conditions; it can be used to test if the tight-binding Hamiltonian of graphene is set correctly); This function calls another three function which should be placed in the same directory (or in the path): atomCoord.m, atomPosition.m, and constrainView.m
self_energy.m (Self-energy of the semi-infinite ideal metallic lead modeled on the square tight-binding lattice - the code shows how to convert analytical formulas of the lead surface Green function into a working program)

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 *[http://www.physics.udel.edu/~bnikolic/teaching/phys824/MATLAB/disordered_nanowire.m disordered_nanowire.m] (code for Problems 2 & 3 in Homework Set 2)
 *[http://www.physics.udel.edu/~bnikolic/teaching/phys824/MATLAB/dos_negf.m dos_negf.m] (code to compute the density of states of a nanowire using Green functions)
+*[http://www.physics.udel.edu/~bnikolic/teaching/phys824/MATLAB/graphene_dos.m graphene_dos.m] (code to compute the density of states of graphene sheet using Green functions)
 *[http://www.physics.udel.edu/~bnikolic/teaching/phys824/MATLAB/qt_1d.m qt_1d.m] (code to compute the conductance and total and local density of states of a 1D nanowire, with possible potential barriers or impurities, attached to two semi-infinite electrodes)