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Showing 1 to 2 of 2 for “"weak coupling approximation"”.
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Spin fluctuations and high temperature superconductivity in the copper oxides
… fluctuation mechanism is first studied within a weak coupling approximation. It is shown that the retarded interaction between quasiparticles on a 2D square lattice induced by the exchange of antiferromagnetic paramagnons leads uniquely to a transition to a superconducting state with dx2-y2 …
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Resonance Fluorescence in a Photonic Crystal
… has a finite memory that inhibits the Markovian approximation. In the Heisenberg picture the equations of motion for the system variables form a infinite hierarchy of integro-differential equations. To get a closed system, approximations like a weak coupling approximation are needed. The thesis …