Feshbach resonance


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Feshbach resonance

[′fesh‚bäk ‚rez·ən·əns]
(quantum mechanics)
A sharp resonance or peak which is seen when the cross section of an atomic or nuclear scattering process is plotted as a function of energy. It is associated with an energy threshold above which the scattering process can lead to a new result (such as excitation or ionization of one of the colliding objects), and it lies at an energy slightly below this threshold.
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Other subjects include dynamics of semirigid rod polymers, the design of soft polymeric composites for electro-mechanical applications, elasticities of lipid membranes versus cell membranes, the dynamics of polymers in solutions with hydrodynamic memory, and formation of molecules and entangled atomic pairs from atomic BEC due to Feshbach resonance.
A realization of this non-equilibrium situation is possible foran ultracold gas of fermions in an optical lattice with commensuratefilling, which is tuned suddenly to the stronglyrepulsive side of a Feshbach resonance.
This requirement can be met by the use of magnetic Feshbach resonances present in Dysprosium.