Abstract
We show that exchange-correlation induced many-body excitonic vertex correction may lead to an instability in the normal ground state of a semiconductor double quantum well structure by suppressing the symmetric-antisymmetric intersubband gap at low but accessible (Å 0.7 × ) electron densities. We predict as a consequence a novel electronic phase transition where the lowest intersubband spin-density-excitation gap vanishes giving rise to a new many-body triplet excitonic liquid ground state which is more stable at low densities than the usual two dimensional Fermi liquid phase.
- Received 15 March 1994
DOI:https://doi.org/10.1103/PhysRevLett.73.1971
©1994 American Physical Society