4 papers
Exciton BCS or BEC state in a semiconductor bilayer system?
E. H. Martins Ferreira, Tathiana Moreira, M. C. Nemes
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 transvers…
Strong enhancement of the persistent current by an embedded quantum dot
E. H. Martins Ferreira, M. C. Nemes, H. A. Weidenmueller
This paper has been withdrawn by the authors due to crucial error on assumption in Eq. 2. We cannot assume v_R and v_L to be equal or even have the same sign.
Persistent current on a disordered mesoscopic ring with an embedded quantum dot
E. H. Martins Ferreira, M. C. Nemes, H. A. Weidenmueller
We calculate the ensemble averaged persistent current on disordered mesoscopic rings with an embedded quantum dot. We model the quantum dot as a single resonance and use Random Mat…
Decoherence effects on the tunneling rate of paramagnetic and superparamagnetic particles
E. H. Martins Ferreira, M. C. Nemes, H. -D. Pfannes
We analyze the effects of the environment on the spin tunneling process of paramagnetic and superparamagnetic particles and conclude that the non assisted macroscopic tunneling rat…