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- W1977322565 abstract "We present a microscopic theory of zero-temperature order parameter and pseudospin stiffness reduction due to quantum fluctuations in the ground state of double-layer quantum Hall ferromagnets. Collective excitations in this system are properly described only when interactions in both direct and exchange particle-hole channels are included. We employ a functional integral approach which is able to account for both, and comment on its relation to diagrammatic perturbation theory. We also discuss its relation to Gaussian fluctuation approximations based on Hubbard-Stratonovich-transformation representations of interactions in ferromagnets and superconductors. We derive remarkably simple analytical expressions for the correlation energy, renormalized order parameter and renormalized pseudospin stiffness." @default.
- W1977322565 created "2016-06-24" @default.
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- W1977322565 date "2001-09-19" @default.
- W1977322565 modified "2023-10-13" @default.
- W1977322565 title "Microscopic functional integral theory of quantum fluctuations in double-layer quantum Hall ferromagnets" @default.
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- W1977322565 doi "https://doi.org/10.1103/physrevb.64.155315" @default.
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