Exciton BCS or BEC state in a semiconductor bilayer system?
E. H. Martins Ferreira, Tathiana Moreira, M. C. Nemes
TL;DR
This paper investigates the conditions under which exciton Bose-Einstein condensation (BEC) or BCS-like states form in a semiconductor bilayer system, emphasizing the role of Coulomb interaction and magnetic field effects.
Contribution
It analytically demonstrates how the width of Coulomb interaction in momentum space influences the formation of exciton condensates in bilayer systems.
Findings
Exciton BEC formation is highly sensitive to the interaction's momentum space width.
Analytical derivation of the dependence of long-range order on interaction parameters.
Key physical insight into exciton condensate stability in bilayer systems.
Abstract
We calculate the off-diagonal long range order (ODLRO) terms of the exciton--exciton correlation function of a semiconductor bilayer system with Coulomb interaction and a transverse magnetic field. We show that the formation of a BEC state is very sensitive to the width of the interaction in momentum space. This dependence is analytically derived and represents the key physical ingredient for the formation (or not) of an exciton condensate state.
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Taxonomy
TopicsSemiconductor Quantum Structures and Devices · Spectroscopy and Quantum Chemical Studies · Quantum Dots Synthesis And Properties