Coolaboration with Claudio
Role of anharmonicity and asimmetry of dimer potential
1) Study anharmonic asimmetric potential: V(x)=0.5*k*x**2-beta*x**3/3
-Understand why anharmonicity destroys hysteresis. -Is there a resonance? -Negative differential mobility near resonance?
Find parameters for Lennard-Jones interaction that mimicks the anharmonic asimmetric potential
2) Study anharmonic simmetric potential V(x)=0.5*k*x2+beta*|x3|/3
3) Double well potential V(x)=alpha*x4-beta*x2
Transition between different states due to resonance
Excitation of internal vibrations (up to dissociation) by moving the substrate
1) 1D dimer
Consider "oscillating" substrate potential of the form
Is there a resonance frequency w for which dimer internal motion is excited?
2) 2D cluster of nanoparticles on a substrate (connection with experiment of Spasova: Co nanoparticles on metal substrate)
Idea: experimentally the nanoparticles form a triangular arrangement on the substrate, but it is desirable to have a uniform coverage. We could probably show that, by exciting a resonance in the cluster, the nanoparticles could dissociate and be pushed away from each other, thus balancing their tendency to clusterization.
At first we can study a model system of LJ particles and see what the equilibrium configuration is and what happens if we move the substrate.