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We study probe D5 branes in D3 brane AdS_5 and AdS_5-Schwarzschildbackgrounds as a prototype dual description of strongly coupled 2+1 dimensionalquasi-particles. We introduce a chemical potential through the U(1)_R symmetrygroup, U(1) baryon number and a U(1) of isospin in the multi-flavour case. Wefind the appropriate D5 embeddings in each case - the embeddings do not exhibitthe spontaneous symmetry breaking that would be needed for a superconductor.The isospin chemical potential does induce the condensation of charged mesonstates.

Chemical Potential in the Gravity Dual of a 2+1 Dimensional System