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- W1489861562 abstract "We derive the ground-state energy of $N$ composite bosons made of fermion pairs using the recently developed composite boson many-body formalism. We concentrate on the $N$-pair energy linear in density. We show that the relevant for length contains not only direct and exchange interaction scatterings but also the dimensionless Pauli scattering for fermion exchange in the absence of fermion-fermion interaction. Numerical resolution of the resulting ladder integral equation for fermions interacting through long-range Coulomb forces --- which act as effective repulsion between excitons made of same-spin electrons and same-spin holes --- shows that the prefactor of the $N$-exciton energy linear in density is substantially decreased from its Born approximation value, $13pi/3$, by a factor $simeq0.38$ for equal electron and hole effective masses. Interestingly, this factor goes to zero when the hole mass goes to infinity, making the triplet-exciton gas unstable in this limit." @default.
- W1489861562 created "2016-06-24" @default.
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- W1489861562 date "2015-06-12" @default.
- W1489861562 modified "2023-09-26" @default.
- W1489861562 title "Coboson many-body approach to the $N$-exciton ground-state energy" @default.
- W1489861562 hasPublicationYear "2015" @default.
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