Robin,
You are describing a local minimum as an energy level that is not the lowest possible, but nevertheless can be obtained with stability. Optimization programs run into this type of problem often. Dave -----Original Message----- From: mixent <[email protected]> To: vortex-l <[email protected]> Sent: Sun, Apr 21, 2013 11:24 pm Subject: Re: [Vo]:What polaritons can do In reply to Axil Axil's message of Sun, 21 Apr 2013 18:16:10 -0400: Hi, [snip] >The negative dipole charge of one micro-particle is antiparallel to the >negative charge of the adjoining particle. This is like two magnets >positioned North Pole to North Pole so that they repel each other. ...actually, I think that would be parallel. Anti-parallel implies IMO, that they tend to align with the electron from one exciton as close as possible to the positive charge on the other. There are two ways you can attach magnets, end to end, or side to side. Which you choose changes the definition of parallel. i.e. N S N S are parallel but attracting. N S S N are anti-parallel but attracting. The same thing can be done with electric dipoles. If left to itself, nature usually chooses the lowest energy configuration. IMO that would not be one where lots of electrons are concentrated in one spot. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
